Remove a few language codes that were 'supported' without any localisation. Have...

Remove a few language codes that were 'supported' without any localisation. Have no known projects that use localisation for them. Language support could be re-added if a sufficient localisation level would be reached in translatewiki.net.
* Ladin (lld) (added in r17267)
* Laz (lzz) (added in r17267)
* Megleno-Romanian (Greek script) (added in r30519)

Also removed trailing whitespace from file.