Add french FR translation

[cregouby]

and for this, move messages back to base::stop(), base::warning()and base:message()

[codecov]

Codecov Report

Merging #131 (9fc5f95) into main (071291c) will decrease coverage by 0.09%.
The diff coverage is 38.00%.

❗ Current head 9fc5f95 differs from pull request most recent head 2400edf. Consider uploading reports for the commit 2400edf to get more accurate results

@@            Coverage Diff             @@
##             main     #131      +/-   ##
==========================================
- Coverage   87.32%   87.24%   -0.09%     
==========================================
  Files          10       10              
  Lines        1215     1215              
==========================================
- Hits         1061     1060       -1     
- Misses        154      155       +1     

Files	Coverage Δ
R/tab-network.R	100.00% <ø> (ø)
R/dials.R	0.00% <0.00%> (ø)
R/parsnip.R	99.08% <0.00%> (ø)
R/explain.R	93.87% <0.00%> (ø)
R/pretraining.R	95.00% <44.44%> (-0.04%)	⬇️
R/model.R	91.44% <53.84%> (ø)
R/hardhat.R	88.93% <34.78%> (-0.35%)	⬇️

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