Customization – try to change colormag-fr_FR.po

How can I change a translation in colormag-fr_FR.po?
In fact, the translation of "current news"Is"new hitsIn French, I changed "RĂ©cent" for "A la Une" in the above file, but nothing had changed after reloading my website.
I would like to be able to modify these translations to translate mine. Thank you in advance.