Fix translation of weightsystem names

This is very much the same as in commit dc03b7e7d689 ("We need the correct
context to translate event names"). I didn't pay enough attention when
reading the bug report and missed that the weight system names were also
not correctly translated.

Fixes #312

(I hope this time for real)

Signed-off-by: Dirk Hohndel <dirk@hohndel.org>
Pull more translations from Transifex

As usual, I am not the author, just the person pulling from Transifex.
Authorship is tracked there (rather badly).

Signed-off-by: Dirk Hohndel <dirk@hohndel.org>