To what extent is the attribution of the two hadiths: "Paradise lies beneath the feet of mothers" and "Whoever learns the language of a people is safe from their evil" to the Messenger, may Allah bless him and grant him peace, authentic?

The phrase "Paradise is under the feet of mothers" is not a prophetic hadith, but its meaning is sound and established in the hadith: "Stay with her, for Paradise is at her feet." As for "Whoever learns the language of a people is safe from their evil," it has not been found as a hadith, but its meaning is sound.