Currently we have "Open in browser" in the right-click menu of a file. For specific files which enable collaborative editing we can change it to "Edit collaboratively".

• This can replace the "Open in browser" entry as it’s basically the same thing but better
• "Open in browser" should be called "Open online", just minor wording
• The entry should be called "Edit collaboratively"
• For odt/ods/odp documents, we need to check on the server if Collabora Online is installed.
• For txt/md we need to check for Nextcloud Text on the server
• We shouldn’t expose the app name as this is not really relevant to regular people.
• It’s focused on Collabora Online, OnlyOffice and Text, and if there are multiple apps to edit with it should just pick 1 for simplicity.

Similarly we could do that for the activity stream in the improved tray menu #877: If a synced file is txt/md/odt/etc the action button could say "Edit" (better wording welcome, but we are short on space).

cc @camilasan @misch7 @DominiqueFuchs for Nextcloud 18, also ref @juliushaertl @karlitschek

(The mockup has a unified menu for right-click, that’s a separate discussion though so feel free to ignore that. ;)