Add localized strings for contributions in About pane

Additionally, an entry for filter list
contributors has been added.

src/_locales/en/messages.json

@@ -359,10 +359,6 @@
     "message":"Block CSP reports",
     "description": "background information: https://github.com/gorhill/uBlock/issues/3150"
   },
-  "settingsStorageUsed":{
-    "message":"Storage used: {{value}} bytes",
-    "description":"Deprecated, will be removed"
-  },
   "settingsLastRestorePrompt":{
     "message":"Last restore:",
     "description":"English: Last restore:"
@@ -831,6 +827,18 @@
     "message":"Contributors",
     "description":"English: Contributors"
   },
+  "aboutSourceCode":{
+    "message":"Source code",
+    "description":"Link text to source code repo"
+  },
+  "aboutTranslations":{
+    "message":"Translations",
+    "description":"Link text to translations repo"
+  },
+  "aboutFilterLists":{
+    "message":"Filter lists",
+    "description":"Link text to uBO's own filter lists repo"
+  },
   "aboutDependencies":{
     "message":"External dependencies (GPLv3-compatible):",
     "description":"Shown in the About pane"

src/about.html

@@ -27,8 +27,9 @@
     <div class="li"><a href="https://github.com/gorhill/uBlock" data-i18n="aboutCode"></a></div>
     <div class="li"><span data-i18n="aboutContributors"></span></div>
     <div class="liul">
-        <div div class="li"><a href="https://github.com/gorhill/uBlock/graphs/contributors">GitHub</a></div>
-        <div div class="li"><a href="https://crowdin.net/project/ublock">Crowdin</a></div>
+        <div class="li"><a href="https://github.com/gorhill/uBlock/graphs/contributors" data-i18n="aboutSourceCode"></a></div>
+        <div div class="li"><a href="https://crowdin.net/project/ublock" data-i18n="aboutTranslations"></a></div>
+        <div div class="li"><a href="https://github.com/uBlockOrigin/uAssets/graphs/contributors" data-i18n="aboutFilterLists"></a></div>
     </div>
     <div class="li"><span data-i18n="aboutDependencies"></span></div>
     <div class="liul">