Merge pull request #369 from nalesnikld/master

update pl.po
Update hr.po
Merge pull request #370 from win32re/patch-41

Update hr.po
Update hr.po
updated bundle (Polish, Bulgarian, Croatian)
Restores very important download actions to Linux users.

Related  to Issue #366
Solves Issue #366, getting correct single transfer file location.
Merge pull request #372 from win32re/patch-42

Update hr.po - hvala prijatelja
Update hr.po
Merge pull request #373 from win32re/patch-43

Update hr.po
isValidMD5() now check length AND hex characters

Changes:

- isValidMD5() now check length AND hex characters.
- code look optimizations.
Caching some values to avoid heavy computation.
Update hr.po
isValidMD5() check length AND hex characters

Changes:

- isValidMD5() now check length AND hex characters.
- code look optimizations.
isValidMD5() now check length AND hex characters

Changes:

- isValidMD5() now check length AND hex characters.
- code look optimizations.
Merge pull request #374 from abderraouf-adjal/patch-1

isValidMD5() now check length AND hex characters
There is no such thing like recovering from an error in L&F.
Better exception handling in ThemeMediator.
Minor cleanup.
Removed gradle facet, still getting resources errors.
Fixed Intellij IDEA resources problem.