Merge branch 'handle-c-locale' into 'master'

Handle C locale.

Closes #236

See merge request jenslody/gnome-shell-extension-openweather!228

src/extension.js

@@ -155,7 +155,9 @@ const OpenweatherMenuButton = new Lang.Class({
         // Get locale, needed for toLocaleString, workaround for gnome-shell 3.24
         this.locale = GLib.get_language_names()[0];
 
-        if (this.locale.indexOf('_') != -1)
+        if (this.locale == 'C')
+            this.locale = 'en';
+        else if (this.locale.indexOf('_') != -1)
             this.locale = this.locale.split("_")[0];
 
         // Create user-agent string from uuid and (if present) the version