[TASK] Sort local extension list for editing

[DavidBruchmann]

fix #760

[DavidBruchmann]

to clarify my rewording in the comments:
We'll have to deal with remote extensions from TER too, so the comments have to be clear about the kind of extensions to avoid any confusion and misunderstanding.

[PKuhlmay]

I added the patch via cherry pick and close this PR. Reason is: Something strange happened, there are some commits inside this PR, which should be inside the target branch already.

Thanks for sorting the extensions. It worked for me.

[DavidBruchmann]

Yeah thanks for picking, I knew I shouldn't have clicked the button for merging something 😆