override translation strings using data attributes

docs/docs/configuration/client.rst

@@ -31,6 +31,14 @@ the embed tag, as well as the thread ID, e.g.:
 
     <section id="isso-thread" data-title="Foo!" data-isso-id="/path/to/resource"></section>
 
+Additionally, you can override any translation string for any language by adding
+a `data-isso-` attribute that is equal to the translation key (found `here`__) with
+`-text-[lang]` appended to it. So, for example, if you want to override the
+english translation of the `postbox-notification` message, you could add
+`data-isso-postbox-notification-lang-en="Select to be notified of replies to your comment"`
+
+.. __: https://github.com/posativ/isso/blob/master/isso/js/app/i18n/en.js
+
 data-isso
 ---------
 
@@ -116,7 +124,7 @@ and not a multiple of 2, the color distribution is not even.
 data-isso-gravatar
 ------------------
 
-Uses gravatar images instead of generating svg images. You have to set 
+Uses gravatar images instead of generating svg images. You have to set
 "data-isso-avatar" to **false** when you want to use this. Otherwise
 both the gravatar and avatar svg image will show up. Please also set
 option "gravatar" to **true** in the server configuration...

isso/js/app/i18n.js

@@ -85,7 +85,10 @@ define(["app/config", "app/i18n/bg", "app/i18n/cs", "app/i18n/da",
     var plural = pluralforms(lang);
 
     var translate = function(msgid) {
-        return catalogue[lang][msgid] || en[msgid] || "???";
+        return config[msgid + '-text-' + lang] ||
+          catalogue[lang][msgid] ||
+          en[msgid] ||
+          "???";
     };
 
     var pluralize = function(msgid, n) {