fwiw, talking to a native speaker, the item below is tricky to translate.
L'accent est l'âme du discours. Accent is the soul of language; it gives to it both feeling and truth.
She said something like: "Even if your regional dialect ("l'accent") is not noticeable in your everyday speech, at times of high emotion like anger, it may appear. In that sense, your accent and your use of local expressions and slang adds emotional depth and a more transparent view into who you really are."