[Patch] Fix user-facing and non-user-facing typos
Follow up to #879 (closed)
(Having issues with submitting a MR, so I'm referencing a patch file)
The patch is at:
https://github.com/KDE/kdenlive/compare/master...luzpaz:typos.patch
To test the patch invoke:
curl https://github.com/KDE/kdenlive/compare/master...luzpaz:typos.patch | git apply -v