Merge pull request #504 from mariroz/dev

translation related: how-to md file added, script to generate php from all twig templates, polish mo file compiled
[fix] Baggy theme navigation bug #485
[add] Empty cache after changing theme #503
[add] empty cache after changing language #492
[fix] hover problem with logout link #489
Merge pull request #510 from mariroz/dev

some baggy theme fixes and enhancement: issue #479
Create pt_BR.utf8.mo
Add brazilian portuguese (pt-BR) translation
	modified:   locale/pt_BR.utf8/LC_MESSAGES/pt_BR.utf8.mo
	renamed:    locale/pt_BR.utf8/LC_MESSAGES/pt_BR.utf8.mo -> locale/pt_BR.utf8/LC_MESSAGES/pt_BR.utf8.po
Merge pull request #513 from camporez/dev

Brazilian portuguese translation
Syntax fix.

I think this will be the smallest commit I'll ever make.
Merge pull request #515 from mariroz/dev

fix of #509, related to php 5.3
effect of block rebuilding on next page removed, issue #479