Fix translation update

[VlasovVitaly]

Fix update script(s) and update translation.

[KA101]

For future reference, what's involved in checking/parsing these? I didn't merge it because I'm not familiar with the language-handling system.

[VlasovVitaly]

Almost all errors are controlled by lang/update-pot script. Script tells to contributor where error is. If no errors, it's safe to commit and merge.
But there is one class of errors that not checked by script. It's unicode decoding error. Sometime pot file has weird chars which can't be encoded to utf8. Right now I don't know how to check this properly.

So, if someone makes PR with translation update that's mean it is save to merge for 90% because update-pot check sources for errors(except utf8 encoding).

After merging all translation systems(launchpad transifex) will be update templates automatically.