* Add flags for torrents
Add a new field, .Language, to the Torrent model, and a new package,
torrentLanguages, which maps languages to flags. Added also a flag icon pack
from googlei18n/region-flags, with (mostly) public domain flags from Wikipedia.
* Optimize flags
* Use FlagSprites CSS instead of .png files
* Only use flags for languages we support
* Add test for CSS flags
Ensure that we have all the flags for the languages we support.
* Add AdditionalLanguages field to config
This allows us to support additional languages for new uploaded torrents,
even if we have no translation for it.
* Minor CSS fix
* Add "other" and "multiple" torrent languages
Also removed the TorrentLanguage struct, as it wasn't much useful.
* Fix test
* Add colspan=2 to category when language is empty
Also hide the language column if empty.
* Add lang field to search.
Hopefully it works with Elasticsearch as well, but I haven't tested
(lol Java)
* Add language field to ES index and settings
* Add language column to JS template
* Add keyword type to language ES field
* Remove 'raw' from keyword
* Set "simple" analyzer on language
* Document .Language field on Torrent model
