Remove word limit on Simplify Lesson

[alainravet1]

See

Allow AI-simplifying longer text

The longer the source text, the more sense Simplify with AI makes. The current 3000 words limit is too small. See: Simplifying lessons - #23 by alainravet1

And

Simplifying lessons

@zoran Could this limit be increased a bit/reasonably? When importing documentary Youtube videos like the one linked below (28 minutes/4500 words), 1°/the spoken contents is not very dense, not optimized for reading, and 2°/ the spoken sententences are broken into multiple half-width lines. The 4500 words become 48 pages (on my tablet)! Not very fun to read. This is the kind of text (not dense and poorly written/formated) I’d like AI-Simplify to rewrite into into 3-5 compact pages of better …