Make I18n systems more robust against missing keys in pluralization data

Should make situations like #4468 less frequent

Changelog.md

@@ -12,6 +12,7 @@
 * Fix preview with more than one mention [#4450](https://github.com/diaspora/diaspora/issues/4450)
 * Fix size of images in the SPV [#4471](https://github.com/diaspora/diaspora/pull/4471)
 * Adjust 404 message description to not leak logged out users if a post exists or not [#4477](https://github.com/diaspora/diaspora/pull/4477)
+* Make I18n system more robust against missing keys in pluralization data
 
 ## Features
 * Add oEmbed content to the mobile view [#4343](https://github.com/diaspora/diaspora/pull/4353)

app/assets/javascripts/helpers/i18n.js

@@ -20,6 +20,10 @@
       translatedMessage,
       nextNamespace;
 
+    if(views && typeof views.count !== "undefined") {
+      items.push(this.pluralizationKey(views.count));
+    }
+
     while(nextNamespace = items.shift()) {
       translatedMessage = (translatedMessage)
         ? translatedMessage[nextNamespace]
@@ -30,10 +34,6 @@
       }
     }
 
-    if(views && typeof views.count !== "undefined") {
-      translatedMessage = translatedMessage[this.pluralizationKey(views.count)];
-    }
-    
     return _.template(translatedMessage, views || {});
    }
  };

lib/i18n_interpolation_fallbacks.rb

@@ -10,6 +10,7 @@ module I18n
             result = super(fallback, key, options)
             return result unless result.nil?
           rescue I18n::MissingInterpolationArgument
+          rescue I18n::InvalidPluralizationData
           end
         end