{{msg-mw|pf-header-edit}}

pf-header-edit ("Edit link")

Is edit verb or noun? What is the context??

This is a column header in a table. In the rows, there are clickable links with description pf-admin-link-editlink-page ("Edit page") that allow users to edit the Package page.

So it should be translated as something like "link for editing". The vast majority of existing translations are wrong and translate it as "edit (the) link". Best to fuzzy the lot of them and start over, IMO.

(I hate English sometimes. It's so ambiguous.)

Does it need to say link in it? Shouldn't that part be obvious?

Is there a restriction on the width of this message, due to being a column header?

As the developer, is it possible to recommend against translation of the messages related to this extension until I have actually developed it and decided on the accurate names for each message?

You get valuable feedback if it is being translated here. Perfect is the enemy of good. If something is temporarily very much work in progress it should be marked clearly as such.