Apparently the .i18n.php shim is causing problems in both production
and beta labs, so for now we'll just generate the .i18n.php file
from the JSON files.
The first half of the conversion script is identical to the shim.
Change-Id: Id606584197d7efcff6fff29ea22cd35dd744b55e
Split the i18n messages into four groups:
* oojs-ui (moved to the oojs-ui repo in a separate commit)
* VE core
* VE-MW (MediaWiki-specific things)
* VE-WMF (Wikimedia-specific things)
The VE-WMF group is new, and we'll split WMF-specific code out into
it later, for now it's just messages associated with that code.
Each language has its own JSON file at modules/MODULE/i18n/LANG.json
Kept messages in VisualEditor.i18n.php as the master copy, because
TranslateWiki can't deal with the JSON files just yet. Added a script
to rebuild the JSON files from the PHP file.
Change-Id: I94e084b2f10994f41324fd08a05ff7f8391ea2eb
