@Aklapper: Done.

I also added two more letters used in the Kurdish language: "Ḧḧ" and "Ẍẍ"

PS: For Kurdish language the right file is MessagesKu_latn.php

Can we make the code more complex?

Inside a Kurdish word, when the letters "î" and "y" are written side by side (i.e "îy"): the "î" loses its circumflex accent becomes "iy" (i.e îy --> iy).

For example, for "Amedî" when you want to add the suffix "-ye" to the word, we don't write "Amedîye" but "Amediye".

Can we make do that, for example "[[Amedî]]ye" appear "Amediye" (i.e "[[Amedî]]ye" -->"Amediye", without the circumflex accent in the internal link).

If before the closing square bracket there is the "î" letter and after the "y" letter (i.e [[..î]]y...): do that the internal link appear without the circumflex accent (i.e [[...î]]y... ---> ...iy...)

Change 327412 had a related patch set uploaded (by MarcoAurelio):
Set $linktrail for MessagesKu_latn.php

https://gerrit.wikimedia.org/r/327412

Can we make do that, for example "[[Amedî]]ye" appear "Amediye" (i.e "[[Amedî]]ye" -->"Amediye", without the circumflex accent in the internal link).

Not possible with a link trail.

Change 327412 merged by jenkins-bot:
Set $linktrail for MessagesKu_latn.php

https://gerrit.wikimedia.org/r/327412