trans_locale too short

[KDederichs]

The trans_locale database field is too short (currently 5 long).
There are some locales like sr_Latn, es_419 and bs_Cyrl for example that will cause an exception on import.
I would suggest to increase the character limit for this field.

[maschmann]

@KDederichs will have a look at the weekend - I was out the past days and will return on Sunday.