Fixed downloading media with proper filenames

Also fixies https://github.com/CODeRUS/mitakuuluu2/issues/253
Added remorse to clean chat history option
Do reload conversation after clearing
Added muting options to Contacts page

Resolving https://github.com/CODeRUS/mitakuuluu2/pull/252
Fix for automatic download media
Buffer size and flags mask fix.
Merge pull request #255 from custodian/buffermask_fix

Buffer size and flags mask fix.
Set autoDownloadWlan default value to true
Set limit of group  subject to 25 symbols (protocol)
locales update
[v0.8.12] Version bump
Merge pull request #1 from CODeRUS/master

test