For example, in Radarr: Settings -> Custom Formats -> click on the + -> Add condition (Language) -> set it to French and make it Required. Create another condition for the English language and set it to required. What we are doing is creating a custom format for when a release has language set to English and French. If both of the conditions are true, the custom format will apply.

Now for your Quality Profile: Settings - > Profile (edit the main quality profile you use for your media, or the one you want this to effect)

You should see custom formats at the bottom, and some settings above for changing the score. For example you could set your minimum to 0, your upgrade until a score of 100, and an increment of 100. Set the language to original, and at the bottom, set your custom format to 100. Now as 0 is your minimum, it will grab releases, but if it can, focus on releases that pass your custom format, so they will have French and English. Releases will also be upgraded during an RSS sync if something that upgrades your score is available.

To be honest, with my Anime setup, I don’t use the custom format language conditions, by the Trash guides, he recommends using release title, so that’s what I use. If this fails to work you can try using regex with release title instead of the language parameter.