Build the LaTeX dictionary files from gettext translations.
Relicense the files to LPPL v1.3c or any later version

This is only a minor change, ie. add the "or any later version" clause.
To the best of my knowledge I do have the permission from all parties
involved to do this change.
Clarify that parts of SDAPS are GPLv3+ and parts are LPPLv1.3c+.
Put LaTeX translations into a separate po directory.

This way the licensing is clear, as the license of tex/po
is LPPLv1.3c+ and po/ is GPLv3+.
Clean file that is created for the LaTeX translations