Anything you'd like to be changed? I'll see what I can do!

Is the mod compatible with Optera's LTN? ( https://mods.factorio.com/mod/LogisticTrainNetwork )

this mod is designed to be compatible with as much mods as possible, so I would say yes.
I'm going to check it specifically :)

If you're willing to, I can make a french locale :)

How strict are the templates? Could there be an option to match the template strict vs. non-strict, i.e. LCC matches LC but not LCCC or LCCL?

Also, the apply button is confusing - it should be called close, as it doesn't seem to apply settings (or maybe it does, but closing also does, which would also be conbfusiong, as it would falsely imply you can "not apply", also, the advanced settings have no apply button, which is confusing - do you have to go back to basic and hit apply?).

As for UI, it woudl also be nice if escape would close the train stop dialog, as with other dialogs in the game.

And as another suggestion/wishlist: it would be nice if this mod wouldn't create fuel jobs for train stations that do not exist, e.g. I have some LLCCCC trains on separate networks that get refueled in a different way, and this mod keeps creating schedules for fuel stations for these trains, even though no fuel station exists. Or maybe do what the train painter mod does and have euipment that enables or disables usage of this mod.

And lastly, it works splendidly with LTN, as far as I can tell.

Ah, another suggestion - LTN allows for very generic refuel "stations" by outputting a signal that binary-encodes positions of locomotives, i.e. a LCCL train will output 5 to signal that the first and 4th entity is a locomotive. That way one can create generic refuel stations for any train up to length 32 or so.