Update es-MX.xml.

Close #316.
Update cs-CZ.xml
Merge pull request #321 from Trottel/patch-7

Update cs-CZ.xml
Update hr-HR.xml

language update
Merge pull request #322 from diomed/patch-1

Update hr-HR.xml
Update hr-HR.xml.

Would be nice to read https://help.github.com/articles/about-git-rebase/

Close #324.
Now also checks for .png files (wrong file type)
Fixed bug in last commit (merge bug)
Remove alignment tags for some formats (not complete)
Fix #326 + unit test
Spaces cleanup (via CodeMain auto-clean-up on save) thx XhmikosR :)
Formatting.

[ci skip]
Updated change log
Merge branch 'master' of https://github.com/SubtitleEdit/subtitleedit
Export to images now remembers shadow width
Tried to fix a few resource leaks
Trying to fix a few resource leaks
Fixed possible crash when workign with a new ASS format file
More fixes for resource leaks
Some fixes for "Remove text for HI" regarding SSA/ASS - thx Thunderbolt8 :)