Support hidden hyphen HTML entity in translation work

Related issue:
- https://github.com/uBlockOrigin/uBlock-issues/issues/907#issuecomment-590804054

src/_locales/da/messages.json

@@ -112,11 +112,11 @@
     "description": "English: Click to open the dashboard"
   },
   "popupTipZapper": {
-    "message": "Gå til elementdræbertilstand",
+    "message": "Gå til elementdræbertil­stand",
     "description": "Tooltip for the element-zapper icon in the popup panel"
   },
   "popupTipPicker": {
-    "message": "Start elementvælgertilstand",
+    "message": "Start elementvælgertil­stand",
     "description": "English: Enter element picker mode"
   },
   "popupTipLog": {

src/js/i18n.js

@@ -72,6 +72,7 @@ const safeTextToTextNode = (function() {
     const entities = new Map([
         // TODO: Remove quote entities once no longer present in translation
         // files. Other entities must stay.
+        [ '­', '\u00AD' ],
         [ '“', '“' ],
         [ '”', '”' ],
         [ '‘', '‘' ],