[tex-hyphen] Corrected version of hyph-la.tex

[Arthur Reutenauer]

	Dear Claudio,

> The differences are
> 1) a preamble similar to the one you made for the other hyph-la-x-*.tex
> files with the MIT licence;
> 2) the addition of a missing pattern.
> 

  We actually already have a file with the Yaml preamble, in the
yaml-headers branch of the repository, I’ll just add the pattern and the
change log entry to that file (it’s 2bc, right?).

	Best,

		Arthur