Bulgarian translation updated by Ivan Cenov (#8380).
remove trailing white-spaces from unit activity test.
remove trailing white-spaces from functional IssuesController test.
remove trailing white-spaces from functional activities controller test.
remove trailing white-spaces from WikiContent model source.
remove trailing white-spaces from Document model source.
remove trailing white-spaces from Attachment model source.
remove trailing white-spaces from changeset model source.
Japanese translation improvement (confirmation messages) by Go MAEDA (#8375).
Japanese translation improvement by Go MAEDA (#8372).
