Add dependent -> :destroy clauses to community and share_type for community_categories
add dependency clauses also for the translations of categories and share_types
Small fixes to mpankki instructions
language fixes in terminology about listings (and offer/requests)
Preevnt non-seller organizations from creating sell listings + icon improvements
Unify logic of showing/disabling FB-connect buttons + add mpankki signup info
replace tabs with 2 spaces in JS files
Fix form submit button disabler
Few small fixes to mails and mail translations
Possibility to use custom sender address as community setting
Fix a bug in community_specific emails
Merge branch 'feature/mpankki_final_fixes' into develop