refactor svg code for icons (#962)

* step-1

* step-2

* add-term-kana

* remove from add-term-kanji

* duplicate kana

* blue versions

* filter ids

6 files changed, 107 insertions, 132 deletions

diff --git a/ext/images/add-duplicate-term-kana-blue.svg b/ext/images/add-duplicate-term-kana-blue.svg
index ef8a9180..efbfc62c 100644
--- a/ext/images/add-duplicate-term-kana-blue.svg
+++ b/ext/images/add-duplicate-term-kana-blue.svg
@@ -1,2 +1,33 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<svg width="16" height="16" version="1.1" viewBox="0 0 16 16" xml:space="preserve" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink"><defs><linearGradient id="linearGradient4719" x1="-1.7198" x2="-1.7198" y1="2.7781" y2="1.4552" gradientTransform="matrix(3.7795 0 0 3.7795 14 .5)" gradientUnits="userSpaceOnUse"><stop stop-color="#8dba64" offset="0"/><stop stop-color="#b4d495" offset="1"/></linearGradient><linearGradient id="linearGradient4745-5" x1="2.1167" x2="1.4552" y1="2.3812" y2="1.7198" gradientTransform="scale(3.7795)" gradientUnits="userSpaceOnUse"><stop stop-color="#376b19" offset="0"/><stop stop-color="#81ab61" offset="1"/></linearGradient><radialGradient id="radialGradient4770-4" cx="2.1167" cy="2.1167" r=".66146" gradientTransform="matrix(2.2677 -7.9311e-7 7.9312e-7 2.2677 2.7 3.7)" gradientUnits="userSpaceOnUse"><stop stop-opacity=".28986" offset="0"/><stop stop-opacity="0" offset="1"/></radialGradient><linearGradient id="linearGradient1389" x1="-1.7198" x2="-1.7198" y1="2.7781" y2="1.4552" gradientTransform="matrix(3.7795 0 0 3.7795 14 .5)" gradientUnits="userSpaceOnUse" xlink:href="#linearGradient4719"/><linearGradient id="linearGradient1391" x1="2.1167" x2="1.4552" y1="2.3812" y2="1.7198" gradientTransform="scale(3.7795)" gradientUnits="userSpaceOnUse" xlink:href="#linearGradient4745-5"/><radialGradient id="radialGradient1393" cx="2.1167" cy="2.1167" r=".66146" gradientTransform="matrix(2.2677,-7.9311e-7,7.9312e-7,2.2677,2.7,3.7)" gradientUnits="userSpaceOnUse" xlink:href="#radialGradient4770-4"/><filter id="filter54" x="-.083333" y="-.083333" width="1.1667" height="1.1667" color-interpolation-filters="sRGB"><feColorMatrix result="color1" type="hueRotate" values="116.90000000000001"/><feColorMatrix result="color2" type="saturate" values="1"/></filter></defs><g transform="translate(2,-2)" filter="url(#filter54)"><circle cx="7.5" cy="8.5" r="3" fill="url(#linearGradient1389)"/><circle cx="7.5" cy="8.5" r="3" fill="none" stroke="url(#linearGradient1391)"/><circle cx="7.5" cy="8.5" r="1.5" fill="url(#radialGradient1393)"/><path d="m6 8h1v-1h1v1h1v1h-1v1h-1v-1h-1v-1" fill="#fff"/></g><g filter="url(#filter54)"><circle cx="7.5" cy="8.5" r="3" fill="url(#linearGradient4719)"/><circle cx="7.5" cy="8.5" r="3" fill="none" stroke="url(#linearGradient4745-5)"/><circle cx="7.5" cy="8.5" r="1.5" fill="url(#radialGradient4770-4)"/><path d="m6 8h1v-1h1v1h1v1h-1v1h-1v-1h-1v-1" fill="#fff"/></g></svg>
+<svg width="16" height="16" version="1.1" viewBox="0 0 16 16" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
+ <defs>
+<linearGradient id="inner-fill" x1="-1.7198" x2="-1.7198" y1="2.7781" y2="1.4552" gradientTransform="matrix(3.7795 0 0 3.7795 14 .5)" gradientUnits="userSpaceOnUse">
+   <stop stop-color="#6fb558" offset="0"/>
+   <stop stop-color="#a5db9b" offset="1"/>
+  </linearGradient>
+  <linearGradient id="outer-rim"  x1="2.1167" x2="1.4552" y1="2.3812" y2="1.7198" gradientTransform="scale(3.7795 3.7795)" gradientUnits="userSpaceOnUse">
+   <stop stop-color="#34812c" offset="0"/>
+   <stop stop-color="#87b870" offset="1"/>
+  </linearGradient>
+  <radialGradient id="center-shadow" cx="2.1167" cy="2.1167" r=".66146" gradientTransform="matrix(2.2677 -7.9311e-7 7.9312e-7 2.2677 2.7 3.7)" gradientUnits="userSpaceOnUse">
+   <stop stop-opacity=".28986" offset="0"/>
+   <stop stop-opacity="0" offset="1"/>
+  </radialGradient>
+  <filter id="green-to-blue" x="-.083333" y="-.083333" width="1.1667" height="1.1667" color-interpolation-filters="sRGB">
+   <feColorMatrix result="color1" type="hueRotate" values="105"/>
+   <feColorMatrix result="color2" type="saturate" values="1"/>
+  </filter>
+  <symbol id="plus-in-circle" viewBox="0 0 16 16">
+    <circle cx="7.5" cy="8.5" r="3" fill="url(#inner-fill)"/>
+    <circle cx="7.5" cy="8.5" r="3" fill="none" stroke="url(#outer-rim)"/>
+    <circle cx="7.5" cy="8.5" r="1.5" fill="url(#center-shadow)"/>
+    <path d="m6 8h1v-1h1v1h1v1h-1v1h-1v-1h-1v-1" fill="#fff"/>
+  </symbol>
+ </defs>
+ <g transform="translate(1,-1)" filter="url(#green-to-blue)">
+  <use xlink:href="#plus-in-circle"/>
+ </g>
+ <g transform="translate(-1,1)" filter="url(#green-to-blue)">
+  <use xlink:href="#plus-in-circle"/>
+ </g>
+</svg>
diff --git a/ext/images/add-duplicate-term-kana.svg b/ext/images/add-duplicate-term-kana.svg
index 9b574aee..267c55ec 100644
--- a/ext/images/add-duplicate-term-kana.svg
+++ b/ext/images/add-duplicate-term-kana.svg
@@ -1,40 +1,33 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <svg width="16" height="16" version="1.1" viewBox="0 0 16 16" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
  <defs>
-  <linearGradient id="linearGradient4719" x1="-1.7198" x2="-1.7198" y1="2.7781" y2="1.4552" gradientTransform="matrix(3.7795 0 0 3.7795 14 .5)" gradientUnits="userSpaceOnUse">
-   <stop stop-color="#8dba64" offset="0"/>
-   <stop stop-color="#b4d495" offset="1"/>
+<linearGradient id="inner-fill" x1="-1.7198" x2="-1.7198" y1="2.7781" y2="1.4552" gradientTransform="matrix(3.7795 0 0 3.7795 14 .5)" gradientUnits="userSpaceOnUse">
+   <stop stop-color="#6fb558" offset="0"/>
+   <stop stop-color="#a5db9b" offset="1"/>
   </linearGradient>
-  <linearGradient id="linearGradient4745-5" x1="2.1167" x2="1.4552" y1="2.3812" y2="1.7198" gradientTransform="scale(3.7795)" gradientUnits="userSpaceOnUse">
-   <stop stop-color="#376b19" offset="0"/>
-   <stop stop-color="#81ab61" offset="1"/>
+  <linearGradient id="outer-rim"  x1="2.1167" x2="1.4552" y1="2.3812" y2="1.7198" gradientTransform="scale(3.7795 3.7795)" gradientUnits="userSpaceOnUse">
+   <stop stop-color="#34812c" offset="0"/>
+   <stop stop-color="#87b870" offset="1"/>
   </linearGradient>
-  <radialGradient id="radialGradient4770-4" cx="2.1167" cy="2.1167" r=".66146" gradientTransform="matrix(2.2677 -7.9311e-7 7.9312e-7 2.2677 2.7 3.7)" gradientUnits="userSpaceOnUse">
+  <radialGradient id="center-shadow" cx="2.1167" cy="2.1167" r=".66146" gradientTransform="matrix(2.2677 -7.9311e-7 7.9312e-7 2.2677 2.7 3.7)" gradientUnits="userSpaceOnUse">
    <stop stop-opacity=".28986" offset="0"/>
    <stop stop-opacity="0" offset="1"/>
   </radialGradient>
-  <linearGradient id="linearGradient1389" x1="-1.7198" x2="-1.7198" y1="2.7781" y2="1.4552" gradientTransform="matrix(3.7795 0 0 3.7795 14 .5)" gradientUnits="userSpaceOnUse" xlink:href="#linearGradient4719"/>
-  <linearGradient id="linearGradient1391" x1="2.1167" x2="1.4552" y1="2.3812" y2="1.7198" gradientTransform="scale(3.7795)" gradientUnits="userSpaceOnUse" xlink:href="#linearGradient4745-5"/>
-  <radialGradient id="radialGradient1393" cx="2.1167" cy="2.1167" r=".66146" gradientTransform="matrix(2.2677,-7.9311e-7,7.9312e-7,2.2677,2.7,3.7)" gradientUnits="userSpaceOnUse" xlink:href="#radialGradient4770-4"/>
-  <filter id="filter1916" x="-.083333" y="-.083333" width="1.1667" height="1.1667" color-interpolation-filters="sRGB">
-   <feColorMatrix result="color1" type="hueRotate" values="260"/>
-   <feColorMatrix result="color2" type="saturate" values="1"/>
-  </filter>
-  <filter id="filter1922" x="-.083333" y="-.083333" width="1.1667" height="1.1667" color-interpolation-filters="sRGB">
-   <feColorMatrix result="color1" type="hueRotate" values="260"/>
+  <filter id="green-to-red" x="-.083333" y="-.083333" width="1.1667" height="1.1667" color-interpolation-filters="sRGB">
+   <feColorMatrix result="color1" type="hueRotate" values="250"/>
    <feColorMatrix result="color2" type="saturate" values="1"/>
   </filter>
+  <symbol id="plus-in-circle" viewBox="0 0 16 16">
+    <circle cx="7.5" cy="8.5" r="3" fill="url(#inner-fill)"/>
+    <circle cx="7.5" cy="8.5" r="3" fill="none" stroke="url(#outer-rim)"/>
+    <circle cx="7.5" cy="8.5" r="1.5" fill="url(#center-shadow)"/>
+    <path d="m6 8h1v-1h1v1h1v1h-1v1h-1v-1h-1v-1" fill="#fff"/>
+  </symbol>
  </defs>
- <g transform="translate(2,-2)" filter="url(#filter1916)">
-  <circle cx="7.5" cy="8.5" r="3" fill="url(#linearGradient1389)"/>
-  <circle cx="7.5" cy="8.5" r="3" fill="none" stroke="url(#linearGradient1391)"/>
-  <circle cx="7.5" cy="8.5" r="1.5" fill="url(#radialGradient1393)"/>
-  <path d="m6 8h1v-1h1v1h1v1h-1v1h-1v-1h-1v-1" fill="#fff"/>
+ <g transform="translate(1,-1)" filter="url(#green-to-red)">
+  <use xlink:href="#plus-in-circle"/>
  </g>
- <g filter="url(#filter1922)">
-  <circle cx="7.5" cy="8.5" r="3" fill="url(#linearGradient4719)"/>
-  <circle cx="7.5" cy="8.5" r="3" fill="none" stroke="url(#linearGradient4745-5)"/>
-  <circle cx="7.5" cy="8.5" r="1.5" fill="url(#radialGradient4770-4)"/>
-  <path d="m6 8h1v-1h1v1h1v1h-1v1h-1v-1h-1v-1" fill="#fff"/>
+ <g transform="translate(-1,1)" filter="url(#green-to-red)">
+  <use xlink:href="#plus-in-circle"/>
  </g>
 </svg>
diff --git a/ext/images/add-duplicate-term-kanji-blue.svg b/ext/images/add-duplicate-term-kanji-blue.svg
index 9e22017e..5a74ae5d 100644
--- a/ext/images/add-duplicate-term-kanji-blue.svg
+++ b/ext/images/add-duplicate-term-kanji-blue.svg
@@ -1,39 +1,37 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <svg width="16" height="16" version="1.1" viewBox="0 0 16 16" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
  <defs>
-  <linearGradient id="linearGradient328" x1="-1.7198" x2="-1.7198" y1="3.5719" y2=".79375" gradientTransform="matrix(3.7795,0,0,3.7795,14.5,-6.308e-7)" gradientUnits="userSpaceOnUse">
+  <linearGradient id="inner-fill" x1="-1.7198" x2="-1.7198" y1="3.5719" y2=".79375" gradientTransform="matrix(3.7795 0 0 3.7795 14.5 -6.308e-7)" gradientUnits="userSpaceOnUse">
    <stop stop-color="#6fb558" offset="0"/>
    <stop stop-color="#a5db9b" offset="1"/>
   </linearGradient>
-  <linearGradient id="linearGradient330" x1="7.5406" x2="5.1594" y1="3.3073" y2=".92604" gradientTransform="matrix(3.7795,0,0,3.7795,-16,-6e-7)" gradientUnits="userSpaceOnUse">
+  <linearGradient id="outer-rim" x1="7.5406" x2="5.1594" y1="3.3073" y2=".92604" gradientTransform="matrix(3.7795 0 0 3.7795 -16 -6e-7)" gradientUnits="userSpaceOnUse">
    <stop stop-color="#34812c" offset="0"/>
    <stop stop-color="#87b870" offset="1"/>
   </linearGradient>
-  <radialGradient id="radialGradient332" cx="2.1167" cy="2.1167" r=".66146" gradientTransform="matrix(4.5354,8.0301e-7,-8.0301e-7,4.5354,-1.6,-1.6)" gradientUnits="userSpaceOnUse">
+  <radialGradient id="center-shadow" cx="2.1167" cy="2.1167" r=".66146" gradientTransform="matrix(4.5354 8.0301e-7 -8.0301e-7 4.5354 -1.6 -1.6)" gradientUnits="userSpaceOnUse">
    <stop stop-opacity=".28986" offset="0"/>
    <stop stop-opacity="0" offset="1"/>
   </radialGradient>
-  <filter id="filter134" x="-.038462" y="-.038462" width="1.0769" height="1.0769" color-interpolation-filters="sRGB">
-   <feColorMatrix result="color1" type="hueRotate" values="105"/>
-   <feColorMatrix result="color2" type="saturate" values="1"/>
-  </filter>
-  <filter id="filter136" x="-.038462" y="-.038462" width="1.0769" height="1.0769" color-interpolation-filters="sRGB">
-   <feColorMatrix result="color1" type="hueRotate" values="105"/>
-   <feColorMatrix result="color2" type="saturate" values="1"/>
+  <filter id="green-to-blue" x="-.038462" y="-.038462" width="1.0769" height="1.0769" color-interpolation-filters="sRGB">
+   <feColorMatrix type="hueRotate" values="105"/>
+   <feColorMatrix type="saturate" values="1"/>
+   <feColorMatrix type="hueRotate" values="0"/>
   </filter>
+
+  <symbol id="plus-in-circle" viewBox="0 0 16 16">
+    <circle cx="8" cy="8" r="6.5" fill="url(#inner-fill)"/>
+    <circle cx="8" cy="8" r="5.75" fill="none" stroke="#fff" stroke-opacity=".50196" stroke-width="1.5"/>
+    <circle cx="8" cy="8" r="6.5" fill="none" stroke="url(#outer-rim)"/>
+    <circle cx="8" cy="8" r="3" fill="url(#center-shadow)"/>
+    <path d="m5 7h2v-2h2v2h2v2h-2v2h-2v-2h-2v-2" fill="#fff"/>
+  </symbol>
  </defs>
- <g transform="matrix(.91504 0 0 .91504 2.2745 -.91504)" filter="url(#filter136)">
-  <circle cx="8" cy="8" r="6.5" fill="url(#linearGradient328)"/>
-  <circle cx="8" cy="8" r="5.75" fill="none" stroke="#fff" stroke-opacity=".50196" stroke-width="1.5"/>
-  <circle cx="8" cy="8" r="6.5" fill="none" stroke="url(#linearGradient330)"/>
-  <circle cx="8" cy="8" r="3" fill="url(#radialGradient332)"/>
-  <path d="m5 7h2v-2h2v2h2v2h-2v2h-2v-2h-2v-2" fill="#fff"/>
+
+ <g transform="matrix(.91504 0 0 .91504 2.2745 -.91504)" filter="url(#green-to-blue)">
+  <use xlink:href="#plus-in-circle"/>
  </g>
- <g transform="matrix(.91504 0 0 .91504 -.91504 2.2745)" filter="url(#filter134)">
-  <circle cx="8" cy="8" r="6.5" fill="url(#linearGradient328)"/>
-  <circle cx="8" cy="8" r="5.75" fill="none" stroke="#fff" stroke-opacity=".50196" stroke-width="1.5"/>
-  <circle cx="8" cy="8" r="6.5" fill="none" stroke="url(#linearGradient330)"/>
-  <circle cx="8" cy="8" r="3" fill="url(#radialGradient332)"/>
-  <path d="m5 7h2v-2h2v2h2v2h-2v2h-2v-2h-2v-2" fill="#fff"/>
+ <g transform="matrix(.91504 0 0 .91504 -.91504 2.2745)" filter="url(#green-to-blue)">
+  <use xlink:href="#plus-in-circle"/>
  </g>
 </svg>
diff --git a/ext/images/add-duplicate-term-kanji.svg b/ext/images/add-duplicate-term-kanji.svg
index 809d0159..fc3279d9 100644
--- a/ext/images/add-duplicate-term-kanji.svg
+++ b/ext/images/add-duplicate-term-kanji.svg
@@ -1,84 +1,37 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <svg width="16" height="16" version="1.1" viewBox="0 0 16 16" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
  <defs>
-  <linearGradient id="linearGradient4582" x1="-1.7198" x2="-1.7198" y1="3.5719" y2=".79375" gradientTransform="matrix(3.7795 0 0 3.7795 14.5 -6.308e-7)" gradientUnits="userSpaceOnUse">
+  <linearGradient id="inner-fill" x1="-1.7198" x2="-1.7198" y1="3.5719" y2=".79375" gradientTransform="matrix(3.7795 0 0 3.7795 14.5 -6.308e-7)" gradientUnits="userSpaceOnUse">
    <stop stop-color="#6fb558" offset="0"/>
    <stop stop-color="#a5db9b" offset="1"/>
   </linearGradient>
-  <linearGradient id="linearGradient4758-7" x1="7.5406" x2="5.1594" y1="3.3073" y2=".92604" gradientTransform="matrix(3.7795 0 0 3.7795 -16 -6e-7)" gradientUnits="userSpaceOnUse">
+  <linearGradient id="outer-rim" x1="7.5406" x2="5.1594" y1="3.3073" y2=".92604" gradientTransform="matrix(3.7795 0 0 3.7795 -16 -6e-7)" gradientUnits="userSpaceOnUse">
    <stop stop-color="#34812c" offset="0"/>
    <stop stop-color="#87b870" offset="1"/>
   </linearGradient>
-  <radialGradient id="radialGradient4683-3" cx="2.1167" cy="2.1167" r=".66146" gradientTransform="matrix(4.5354 8.0301e-7 -8.0301e-7 4.5354 -1.6 -1.6)" gradientUnits="userSpaceOnUse">
+  <radialGradient id="center-shadow" cx="2.1167" cy="2.1167" r=".66146" gradientTransform="matrix(4.5354 8.0301e-7 -8.0301e-7 4.5354 -1.6 -1.6)" gradientUnits="userSpaceOnUse">
    <stop stop-opacity=".28986" offset="0"/>
    <stop stop-opacity="0" offset="1"/>
   </radialGradient>
-  <linearGradient id="linearGradient328" x1="-1.7198" x2="-1.7198" y1="3.5719" y2=".79375" gradientTransform="matrix(3.7795,0,0,3.7795,14.5,-6.308e-7)" gradientUnits="userSpaceOnUse" xlink:href="#linearGradient4582"/>
-  <linearGradient id="linearGradient330" x1="7.5406" x2="5.1594" y1="3.3073" y2=".92604" gradientTransform="matrix(3.7795,0,0,3.7795,-16,-6e-7)" gradientUnits="userSpaceOnUse" xlink:href="#linearGradient4758-7"/>
-  <radialGradient id="radialGradient332" cx="2.1167" cy="2.1167" r=".66146" gradientTransform="matrix(4.5354,8.0301e-7,-8.0301e-7,4.5354,-1.6,-1.6)" gradientUnits="userSpaceOnUse" xlink:href="#radialGradient4683-3"/>
-  <filter id="filter554" x="-.038462" y="-.038462" width="1.0769" height="1.0769" color-interpolation-filters="sRGB">
-   <feColorMatrix result="color1" type="hueRotate" values="250"/>
-   <feColorMatrix result="fbSourceGraphic" type="saturate" values="1"/>
-   <feColorMatrix in="fbSourceGraphic" result="fbSourceGraphicAlpha" values="0 0 0 -1 0 0 0 0 -1 0 0 0 0 -1 0 0 0 0 1 0"/>
-   <feColorMatrix in="fbSourceGraphic" result="color1" type="hueRotate" values="0"/>
-   <feColorMatrix result="fbSourceGraphic" type="saturate" values="1"/>
-   <feColorMatrix in="fbSourceGraphic" result="fbSourceGraphicAlpha" values="0 0 0 -1 0 0 0 0 -1 0 0 0 0 -1 0 0 0 0 1 0"/>
-   <feColorMatrix in="fbSourceGraphic" result="color1" type="hueRotate" values="0"/>
-   <feColorMatrix result="fbSourceGraphic" type="saturate" values="1"/>
-   <feColorMatrix in="fbSourceGraphic" result="fbSourceGraphicAlpha" values="0 0 0 -1 0 0 0 0 -1 0 0 0 0 -1 0 0 0 0 1 0"/>
-   <feColorMatrix in="fbSourceGraphic" result="color1" type="hueRotate" values="0"/>
-   <feColorMatrix result="fbSourceGraphic" type="saturate" values="1"/>
-   <feColorMatrix in="fbSourceGraphic" result="fbSourceGraphicAlpha" values="0 0 0 -1 0 0 0 0 -1 0 0 0 0 -1 0 0 0 0 1 0"/>
-   <feColorMatrix in="fbSourceGraphic" result="color1" type="hueRotate" values="0"/>
-   <feColorMatrix result="fbSourceGraphic" type="saturate" values="1"/>
-   <feColorMatrix in="fbSourceGraphic" result="fbSourceGraphicAlpha" values="0 0 0 -1 0 0 0 0 -1 0 0 0 0 -1 0 0 0 0 1 0"/>
-   <feColorMatrix in="fbSourceGraphic" result="color1" type="hueRotate" values="0"/>
-   <feColorMatrix result="fbSourceGraphic" type="saturate" values="1"/>
-   <feColorMatrix in="fbSourceGraphic" result="fbSourceGraphicAlpha" values="0 0 0 -1 0 0 0 0 -1 0 0 0 0 -1 0 0 0 0 1 0"/>
-   <feColorMatrix in="fbSourceGraphic" result="color1" type="hueRotate" values="0"/>
-   <feColorMatrix result="fbSourceGraphic" type="saturate" values="1"/>
-   <feColorMatrix in="fbSourceGraphic" result="fbSourceGraphicAlpha" values="0 0 0 -1 0 0 0 0 -1 0 0 0 0 -1 0 0 0 0 1 0"/>
-   <feColorMatrix in="fbSourceGraphic" result="color1" type="hueRotate" values="0"/>
-   <feColorMatrix result="color2" type="saturate" values="1"/>
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-  <filter id="filter795" x="-.038462" y="-.038462" width="1.0769" height="1.0769" color-interpolation-filters="sRGB">
-   <feColorMatrix result="color1" type="hueRotate" values="250"/>
-   <feColorMatrix result="fbSourceGraphic" type="saturate" values="1"/>
-   <feColorMatrix in="fbSourceGraphic" result="fbSourceGraphicAlpha" values="0 0 0 -1 0 0 0 0 -1 0 0 0 0 -1 0 0 0 0 1 0"/>
-   <feColorMatrix in="fbSourceGraphic" result="color1" type="hueRotate" values="0"/>
-   <feColorMatrix result="fbSourceGraphic" type="saturate" values="1"/>
-   <feColorMatrix in="fbSourceGraphic" result="fbSourceGraphicAlpha" values="0 0 0 -1 0 0 0 0 -1 0 0 0 0 -1 0 0 0 0 1 0"/>
-   <feColorMatrix in="fbSourceGraphic" result="color1" type="hueRotate" values="0"/>
-   <feColorMatrix result="fbSourceGraphic" type="saturate" values="1"/>
-   <feColorMatrix in="fbSourceGraphic" result="fbSourceGraphicAlpha" values="0 0 0 -1 0 0 0 0 -1 0 0 0 0 -1 0 0 0 0 1 0"/>
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-   <feColorMatrix in="fbSourceGraphic" result="color1" type="hueRotate" values="0"/>
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-   <feColorMatrix in="fbSourceGraphic" result="fbSourceGraphicAlpha" values="0 0 0 -1 0 0 0 0 -1 0 0 0 0 -1 0 0 0 0 1 0"/>
-   <feColorMatrix in="fbSourceGraphic" result="color1" type="hueRotate" values="0"/>
-   <feColorMatrix result="fbSourceGraphic" type="saturate" values="1"/>
-   <feColorMatrix in="fbSourceGraphic" result="fbSourceGraphicAlpha" values="0 0 0 -1 0 0 0 0 -1 0 0 0 0 -1 0 0 0 0 1 0"/>
-   <feColorMatrix in="fbSourceGraphic" result="color1" type="hueRotate" values="0"/>
-   <feColorMatrix result="fbSourceGraphic" type="saturate" values="1"/>
-   <feColorMatrix in="fbSourceGraphic" result="fbSourceGraphicAlpha" values="0 0 0 -1 0 0 0 0 -1 0 0 0 0 -1 0 0 0 0 1 0"/>
-   <feColorMatrix in="fbSourceGraphic" result="color1" type="hueRotate" values="0"/>
-   <feColorMatrix result="color2" type="saturate" values="1"/>
+  <filter id="green-to-red" x="-.038462" y="-.038462" width="1.0769" height="1.0769" color-interpolation-filters="sRGB">
+   <feColorMatrix type="hueRotate" values="250"/>
+   <feColorMatrix type="saturate" values="1"/>
+   <feColorMatrix type="hueRotate" values="0"/>
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+
+  <symbol id="plus-in-circle" viewBox="0 0 16 16">
+    <circle cx="8" cy="8" r="6.5" fill="url(#inner-fill)"/>
+    <circle cx="8" cy="8" r="5.75" fill="none" stroke="#fff" stroke-opacity=".50196" stroke-width="1.5"/>
+    <circle cx="8" cy="8" r="6.5" fill="none" stroke="url(#outer-rim)"/>
+    <circle cx="8" cy="8" r="3" fill="url(#center-shadow)"/>
+    <path d="m5 7h2v-2h2v2h2v2h-2v2h-2v-2h-2v-2" fill="#fff"/>
+  </symbol>
  </defs>
- <g transform="matrix(.91504 0 0 .91504 2.2745 -.91504)" filter="url(#filter795)">
-  <circle cx="8" cy="8" r="6.5" fill="url(#linearGradient328)"/>
-  <circle cx="8" cy="8" r="5.75" fill="none" stroke="#fff" stroke-opacity=".50196" stroke-width="1.5"/>
-  <circle cx="8" cy="8" r="6.5" fill="none" stroke="url(#linearGradient330)"/>
-  <circle cx="8" cy="8" r="3" fill="url(#radialGradient332)"/>
-  <path d="m5 7h2v-2h2v2h2v2h-2v2h-2v-2h-2v-2" fill="#fff"/>
+
+ <g transform="matrix(.91504 0 0 .91504 2.2745 -.91504)" filter="url(#green-to-red)">
+  <use xlink:href="#plus-in-circle"/>
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- <g transform="matrix(.91504 0 0 .91504 -.91504 2.2745)" filter="url(#filter554)">
-  <circle cx="8" cy="8" r="6.5" fill="url(#linearGradient328)"/>
-  <circle cx="8" cy="8" r="5.75" fill="none" stroke="#fff" stroke-opacity=".50196" stroke-width="1.5"/>
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-  <path d="m5 7h2v-2h2v2h2v2h-2v2h-2v-2h-2v-2" fill="#fff"/>
+ <g transform="matrix(.91504 0 0 .91504 -.91504 2.2745)" filter="url(#green-to-red)">
+  <use xlink:href="#plus-in-circle"/>
  </g>
 </svg>
diff --git a/ext/images/add-term-kana.svg b/ext/images/add-term-kana.svg
index bb964476..3578c5e0 100644
--- a/ext/images/add-term-kana.svg
+++ b/ext/images/add-term-kana.svg
@@ -1,23 +1,23 @@
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-   <stop stop-color="#8dba64" offset="0"/>
-   <stop stop-color="#b4d495" offset="1"/>
+  <linearGradient id="inner-fill" x1="-1.7198" x2="-1.7198" y1="2.7781" y2="1.4552" gradientTransform="matrix(3.7795 0 0 3.7795 14 .5)" gradientUnits="userSpaceOnUse">
+   <stop stop-color="#6fb558" offset="0"/>
+   <stop stop-color="#a5db9b" offset="1"/>
   </linearGradient>
-  <linearGradient id="linearGradient4745-5" x1="2.1167" x2="1.4552" y1="2.3812" y2="1.7198" gradientTransform="scale(3.7795 3.7795)" gradientUnits="userSpaceOnUse">
-   <stop stop-color="#376b19" offset="0"/>
-   <stop stop-color="#81ab61" offset="1"/>
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+   <stop stop-color="#34812c" offset="0"/>
+   <stop stop-color="#87b870" offset="1"/>
   </linearGradient>
-  <radialGradient id="radialGradient4770-4" cx="2.1167" cy="2.1167" r=".66146" gradientTransform="matrix(2.2677 -7.9311e-7 7.9312e-7 2.2677 2.7 3.7)" gradientUnits="userSpaceOnUse">
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    <stop stop-opacity=".28986" offset="0"/>
    <stop stop-opacity="0" offset="1"/>
   </radialGradient>
  </defs>
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-  <circle cx="7.5" cy="8.5" r="3" fill="none" stroke="url(#linearGradient4745-5)"/>
-  <circle cx="7.5" cy="8.5" r="1.5" fill="url(#radialGradient4770-4)"/>
+  <circle cx="7.5" cy="8.5" r="3" fill="url(#inner-fill)"/>
+  <circle cx="7.5" cy="8.5" r="3" fill="none" stroke="url(#outer-rim)"/>
+  <circle cx="7.5" cy="8.5" r="1.5" fill="url(#center-shadow)"/>
   <path d="m6 8h1v-1h1v1h1v1h-1v1h-1v-1h-1v-1" fill="#fff"/>
  </g>
 </svg>
diff --git a/ext/images/add-term-kanji.svg b/ext/images/add-term-kanji.svg
index 3737eaec..102b9aaf 100644
--- a/ext/images/add-term-kanji.svg
+++ b/ext/images/add-term-kanji.svg
@@ -1,24 +1,24 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <svg width="16" height="16" version="1.1" viewBox="0 0 16 16" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
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    <stop stop-color="#6fb558" offset="0"/>
    <stop stop-color="#a5db9b" offset="1"/>
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-  <linearGradient id="linearGradient4758-7" x1="7.5406" x2="5.1594" y1="3.3073" y2=".92604" gradientTransform="matrix(3.7795 0 0 3.7795 -16 -6e-7)" gradientUnits="userSpaceOnUse">
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    <stop stop-opacity="0" offset="1"/>
   </radialGradient>
  </defs>
  <g>
-  <circle cx="8" cy="8" r="6.5" fill="url(#linearGradient4582)"/>
+  <circle cx="8" cy="8" r="6.5" fill="url(#inner-fill)"/>
   <circle cx="8" cy="8" r="5.75" fill="none" stroke="#fff" stroke-opacity=".50196" stroke-width="1.5"/>
-  <circle cx="8" cy="8" r="6.5" fill="none" stroke="url(#linearGradient4758-7)"/>
-  <circle cx="8" cy="8" r="3" fill="url(#radialGradient4683-3)"/>
+  <circle cx="8" cy="8" r="6.5" fill="none" stroke="url(#outer-rim)"/>
+  <circle cx="8" cy="8" r="3" fill="url(#center-shadow)"/>
   <path d="m5 7h2v-2h2v2h2v2h-2v2h-2v-2h-2v-2" fill="#fff"/>
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