POTFILES.in: add search provider file
ephy-download-test.c: initialize the file_helpers earlier

The shell needs these to be ready, otherwise the test will break.
Updated Slovenian translation
ephy-encodings-test.c: shutdown the helper files at the end

Now that the shell holds a reference to the bookmark files it
is not possible to shutdown the helper files before shell has
been disposed. Actually, that never made sense.
Updated Galician translations
Updated Brazilian Portuguese translation