added a possibility to pass the localaization setting, (i.e. ?locale=de) as an url parameter throughout all of the application. This changed every url and therefor causes a lot of routing errors to occur in the current tests
modified some tests to adapt to the new routing system introduced by the localization
fixed the filter by chair function by deleting arbitrary plural ending from chairs to just chair
resolved merge conflicts
Merge remote-tracking branch 'origin/develop-ja' into develop-ja-localisation

Conflicts:
	app/views/job_offers/_sort_filter_search.html.erb
	app/views/job_offers/show.html.erb
	config/routes.rb
	spec/controllers/job_offers_controller_spec.rb
resolved merge conflicts by using checkout --theirs for all files except for the app/views/job_offers/show.html.erb file since a localisation specific translation path has changed
Merge remote-tracking branch 'origin/develop-ja' into develop-ja-localisation [ci—skip]

Conflicts:
	app/controllers/job_offers_controller.rb
	spec/controllers/job_offers_controller_spec.rb
always used --theirs in merge
Merge remote-tracking branch 'origin/develop-ja' into develop-ja-localisation
fixed merging errors [ci skip]
applied fix for routes, so the routing in tests will also use the default localisation parameters

https://github.com/rspec/rspec-rails/issues/255
fixed deprecation warnings, removed puts, fixed buttons in show
translation for pagination
translation of sidebar
translated chairs
translated some missing items [ci skip]
fixed a translate in the overview form
added missing translations for the job_offers/new view
replaced hard coded path 'job_offers/find_jobs' with find_jobs_job_offers_path so that the localisation still works on the redirect
changed the name of the job_offer controller method 'find_jobs' to 'find' in order to stay consistent in the naming scheme