'de' locale: Add file/folder distinguishing, extensions UI updates/available strings
'de' locale: Add file/folder distinguishing, extensions UI updates/available strings
Merge branch 'mynetx/l10n-de'

Conflicts:
	src/nls/de/strings.js
'de' locale: Use consistent wording for "[to] update" and "update(s)"
Merge pull request #4639 from mynetx/l10n-de

Update 'de' locale