“no comments” in french !

hello everyone,

i’m running a wp blog in french. my visitors do not leave much comments.
i guess one of the reasons is that the words “no comments” may be not clear enough for the basic french man !
i would like they can read instead something like “leave a comments !”

how can i do this ? i guess it is possible. i went a little bit trouhgt the CSS but i do not know where should i make the change ! i’m a total neophyte in coding.

like “no comments”, there a few words i would like to change, for exemple “Pages” in the right column.

thank’s for your help !