i18n: Translate dock.ts in fr (#997)

100% translated source file: 'dock.ts'
on 'fr'.

Log:

Author: transifex-integration[bot]

panels/dock/dcc-dock-plugin/translations/dock_fr.ts

@@ -105,11 +105,11 @@
     </message>
     <message>
         <source>Classic Mode</source>
-        <translation type="unfinished"/>
+        <translation>Mode classique</translation>
     </message>
     <message>
         <source>Centered Mode</source>
-        <translation type="unfinished"/>
+        <translation>Mode centré</translation>
     </message>
     <message>
         <source>Fashion Mode</source>