Fixes #3846 - Simple quote characters (') not properly displayed.

app/assets/javascripts/app/controllers/_ui_element/basedate.coffee

@@ -155,4 +155,4 @@ class App.UiElement.basedate
       clear: __('clear')
     }
 
-    App.i18n.translateDeep(data)
+    App.i18n.translateDeepPlain(data)

app/assets/javascripts/app/lib/app_post/i18n.coffee

@@ -8,7 +8,12 @@ class App.i18n
   @translateDeep: (input, args...) ->
     if _instance == undefined
       _instance ?= new _i18nSingleton()
-    _instance.translateDeep(input, args)
+    _instance.translateDeep(input, args, false)
+
+  @translateDeepPlain: (input, args...) ->
+    if _instance == undefined
+      _instance ?= new _i18nSingleton()
+    _instance.translateDeep(input, args, true)
 
   @translateContent: (string, args...) ->
     if _instance == undefined
@@ -205,17 +210,20 @@ class _i18nSingleton extends Spine.Module
     return string if !string
     @translate(string, args, true)
 
-  translateDeep: (input, args) =>
+  translateDeep: (input, args, plain) =>
     if _.isArray(input)
       _.map input, (item) =>
-        @translateDeep(item, args)
+        @translateDeep(item, args, plain)
     else if _.isObject(input)
       _.reduce _.keys(input), (memo, item) =>
-        memo[item] = @translateDeep(input[item])
+        memo[item] = @translateDeep(input[item], args, plain)
         memo
       , {}
     else
-      @translateInline(input, args)
+      if plain
+        @translatePlain(input, args)
+      else
+        @translateInline(input, args)
 
 
   translateContent: (string, args) =>

public/assets/tests/qunit/i18n.js

@@ -71,6 +71,24 @@ QUnit.test('i18n', assert => {
   translated = App.i18n.translateInline('yes')
   assert.equal(translated, 'ja', 'de-de - yes / ja translated correctly')
 
+  translated = App.i18n.translateDeep({
+    days: ['Sunday', 'Monday', 'Tuesday', 'Wednesday', 'Thursday', 'Friday', 'Saturday'],
+    today: 'today',
+  })
+  assert.deepEqual(translated, {
+    days: ['Sonntag', 'Montag', 'Dienstag', 'Mittwoch', 'Donnerstag', 'Freitag', 'Samstag'],
+    today: 'Heute',
+  }, 'de-de - deep object/array translated correctly')
+
+  translated = App.i18n.translateDeepPlain({
+    days: ['Sunday', 'Monday', 'Tuesday', 'Wednesday', 'Thursday', 'Friday', 'Saturday'],
+    today: 'today',
+  })
+  assert.deepEqual(translated, {
+    days: ['Sonntag', 'Montag', 'Dienstag', 'Mittwoch', 'Donnerstag', 'Freitag', 'Samstag'],
+    today: 'Heute',
+  }, 'de-de - deep object/array translated correctly')
+
   translated = App.i18n.translateContent('%s ago', 123);
   assert.equal(translated, 'vor 123', 'de-de - %s')