Set form language
Merge pull request #2289 from opf/hotfix/17506_type_new_edit_page_not_properly_translated

17506 Type new/edit page not properly translated
Correct styling for unavailable macros
Merge pull request #2292 from opf/hotfix/17028_wiki_cannot_render_timeline_macro_error_message_style

17028 Macro unavailable error is not correctly styled
Merge branch 'release/4.0' into dev