Translate main strings in French

[olivierperez]

Task/Issue URL: #559

Description

Steps to test this PR

FR translation

1. Switch your device to French
2. Navigate through the app (mostly around Bookmarks and Widgets)

UI changes

I cannot build the app, I face this message

Execution failed for task ':app:generateJsonModelInternalDebug'.
E:\progs\android\Duckduckgo\app\CMakeLists.txt : C/C++ internalDebug|arm64-v8a : CMake Error at E:\progs\android\Duckduckgo\app\CMakeLists.txt:13 (add_library):
Cannot find source file:

And no file listed below it 🤷

If you could help me on that build I would add screenshots 👍

[cmonfortep]

Thanks for the contribution @olivierperez. However, we are currently using an external service to request translations and we updated the contribution guidelines to reflect that. See our comment in the issue you linked on the description #559 (comment).

"We only accept translations tweaks that fix actual issues (typos, grammatical errors) and won't accept minor changes that are only focused on tweaking the wording."

The strings you translated are in our "untranslated" string files because we still need to send those strings to our translation team. We will accept contributions for fixes once they have been already translated.

[olivierperez]

Whoops, my bad, I didn't see this information.
However, if you want to use theses translations into the external service you use, feel free to do so 👍