[FEATURE] Tag to disable automatic localization

[viciious]

Occasionally one might want a string not to be translated/localized at all, e.g: a nickname, a song title, etc. As of now, libRocket calls SystemInterface::TranslateString for everything.

[dwimsey]

Is this causing a noticeable performance issue? Or more appropriately, why since you can just not translate those items in TranslateString?

[viciious]

It's more a convenience issue than a performance issue. For instance, in our game we display list of your friends whom you can interact with in certain ways or see their game status.
Obviously, we want their aliases/nicknames to be consistent across the UI, the web forum and parts of the game where we don't use libRocket: e.g., game chat.