Adding to the French translation file

[ejazzfr]

As a total beginner — and impressed — with YAD —, I have noticed the lack of French translation for the default buttons “Cancel” and “OK” .

The solution is straightforward :
1/ Edit the source file YAD-source/po/fr.po;
2/ Change lines 77 and 82 from msgstr "" to msgstr "Annuler" and msgstr "Valider" respectively;
3/ Recompile the source with the traditional process or in order to have a Debian package.

For constitency, you may also want to change the lines 397 and 1377 as fowllow:

395| #: src/option.c:134
396| msgid "Escape acts like OK button"
397| msgstr "L'échappement agit comme le bouton Valider"

1375| #: src/option.c:617
1376| msgid "Kill parent process if cancel button is pressed"
1377| msgstr "Tuer le processus parent quand le bouton Annuler est pressé"

[v1cont]

please, make a pull request with appropriate changes. thank you