Made a few improvements in the french translation.
Revert a change (oeil->œil) which make harder to search items by typing theirs names. Because "œ" is not in the AZERTY keyboard.
Reviewed-on: https://git.minetest.land/MineClone2/MineClone2/pulls/4194
Reviewed-by: the-real-herowl <the-real-herowl@noreply.git.minetest.land>
Co-authored-by: syl <syl@gresille.org>
Co-committed-by: syl <syl@gresille.org>
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