Add french translation (#417)

technic_chests/locale/fr.txt

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+# technic_chests translation template
+
+%s Chest                      = Coffre en %s
+%s Locked Chest               = Coffre vérouillé en %s
+%s Locked Chest (owned by %s) = Coffre vérouillé en %s (appartenant à %s)
+Color Filter: %s              = Filtre couleur : %s
+Edit chest description:       = Editer la descrition du coffre
+
+# Colors
+Black                         = Noir
+Blue                          = Bleu
+Brown                         = Marron
+Cyan                          = Cyan
+Dark Green                    = Vert sombre
+Dark Grey                     = Gris sombre
+Green                         = Vert
+Grey                          = Gris
+Magenta                       = Magenta
+Orange                        = Orange
+Pink                          = Rose
+Red                           = Rouge
+Violet                        = Violet
+White                         = Blanc
+Yellow                        = Jaune
+None                          = Rien
+
+# Materials
+Copper                        = Cuivre
+Gold                          = Or
+Iron                          = Fer
+Mithril                       = Mithril
+Silver                        = Argent
+Wooden                        = Bois
+
+# Sorting
+Sort                          = Tri
+Auto-sort is %s               = Tri automatique %s
+Off                           = inactivé
+On                            = activé