updatet gitignore
removing strange help texts in request/offer form
rails translation update, small fix in our german translation
adding convinience method for i18n with models
fixing - #15244034710285 - a missing translation, a bit of i18n refactoring
Merge branch 'master' into dev

Conflicts:
	app/views/layouts/application.html.erb
	app/views/offers/_form.html.erb
	app/views/offers/_list.html.erb
	app/views/requests/_form.html.erb
	app/views/requests/_list.html.erb
	config/locales/de.yml
	config/locales/en.yml