[hotfix] check daily email limit before sending emails

Patch old event colors to hex

[minor] make email alert configurable, so we can use it list default print formats

[hotfix] filters with the special characters are escaped twice

[minor] fix of translatable terms

[hotfix] Website theme

Update file.py

Don't unnecessarily encode os.path.join() and os.path.abspath()

Use repr() instead of backticks

Show totals row always in query report

Give developers the ability to generate several sizes of thumbnails.

[hotfix] don't allow no value fields in the search fields

Import six.moves.urllib.parse.urlencode instead of urllib.urlencode

Import six.StringIO instead of StringIO.StringIO