using TemplateResponse
docs and missed response
fixed tests
Merge pull request #1752 from digi604/template_response

using TemplateResponse in cms.views
Fixed bad grammar/language.

I tried to improve the grammar/language of the `LanguageCookieMiddleware` a bit by rewriting the corresponding paragraph.
Feel free to apply further improvements to it as I'm a non-native English speaker :)
Merge pull request #1762 from eliasp/patch-1

Fixed bad grammar/language.
Merge branch 'develop' into frontend_languages

Conflicts:
	CHANGELOG.txt