Merge pull request #50 from TheoChevalier/branding

Add style to the mailing list form, fix the RWD for some imgs on home page
Fix month names encoding
Add "The day we fight back" banner
Issue # 51: add April banner + change line endings in file to Unix
Merge pull request #52 from pascalchevrel/issue-51-integrate-april-campaign

Issue # 51: add April banner + change line endings in file to Unix