There are many of comic strips and graphic novels in languages other than English. Sadly, there doesn't appear to be a site aggregating them all by language! However, a search for comics or graphic novels is easy!
The use of the comics goes beyond simply using previously made comics in the classroom. Asking students to create their own comics with tools such as the one mentioned in this guide can provoke understanding and creativity. There are also students who enjoy drawing and creating their own this way. I have had positive responses to using comics in the classroom--though not judging the artistic talent or effort of each student, since some are better or worse than others.
Here are more ideas for how to incorperate comics. I believe that incorperating grammar into the lesson along with the comic. Rather than the traditional way of explaining the grammar, using a comic or multiple comics which use the focus as well to introduce talking about the subject.
This article gives many pedagogical uses for comics in the classroom. I personally like the ability to use comics to incorperate cultural competence to the classroom. The issues can be introduced by using political cartoons. Historical issues can also be introduced this way!
The research on using graphic novels to teach a second language indicate that they're a source of motivation for the students as well as providing another strategy for language learning--the use of context clues. This study indicated that graphic novels improved the students' ability to understand more literary concepts as well as vocabulary.