Add French language support (cleaned up by me)

app/src/main/res/values/arrays.xml

@@ -28,6 +28,7 @@
             <item>中文(繁體)</item>
             <item>Korean</item>
             <item>Español</item>
+            <item>French</item>
     </string-array>
     <string-array name="language_values" translatable="false">
             <item>default</item>
@@ -40,6 +41,7 @@
             <item>zh-TW</item>
             <item>ko</item>
             <item>es</item>
+            <item>fr</item>
     </string-array>
 
     <string-array name="decoder_names">