Update strings.xml / fix French mistakes

[farvardin]

update french

PR Checklist

Please check all that apply to this PR using "x":

• [x] I have checked that this PR is not a duplicate of an existing PR (open, closed or merged)
• [x] I have checked that this PR does not introduce a breaking change
• [ ] This PR introduces breaking changes and I have provided a detailed explanation below

PR Type

What kind of change does this PR introduce?

• [x] Bugfix
• [ ] Feature
• [ ] Code style update (formatting)
• [ ] Refactoring (no functional changes)
• [ ] Documentation changes
• [ ] Other - Please describe:

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What is the current behavior?

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