git-gui: po: fix typo in French "aperçu"

The French word "aperçu", meaning "view" or "preview", contains only a
single letter "p".  Remove the extra letter, which is an obvious typo.

Reported-by: Léonard Michelet <[email protected]>
Signed-off-by: brian m. carlson <[email protected]>
Signed-off-by: Johannes Sixt <[email protected]>

Author: bk2204

po/fr.po

@@ -1646,7 +1646,7 @@ msgstr "Dépôt Git (sous projet)"
 
 #: lib/diff.tcl:222
 msgid "* Binary file (not showing content)."
-msgstr "* Fichier binaire (pas d'apperçu du contenu)."
+msgstr "* Fichier binaire (pas d'aperçu du contenu)."
 
 #: lib/diff.tcl:227
 #, tcl-format