Improved Language Support

Language Core

1. Completely rewritten language core, with new support for plurals, and current support implemented for plural rules 0 - 2 (ref: MDN: Plurals)
2. Backwards compatible with current (v1) localisations.

Improved Coverage

1. Language support now covers server-side events, as well as client events.

Language Improvements

1. Updated English.
2. Retranslated Hungarian by Markus.
3. Retranslated German by roxas.
4. Retranslated Turkish by Bambo.