course/format/topcoll laguage files should be utf8-encoded

Some files there (in particular in fr/ and pl/) seem to be latin1-encoded. This leads to errors when one wants to use the "Language customization" functionality of Moodle 2.0. Moodle 2.0 tries to checkout all strings in a DB table (mdl_report_customlang), which fails if strings files are not utf8-encoded.

Affects Collapsed Weeks too.