updated "à propos" to "infos" (#1142)

problem with "à propos", in responsive, it doesn't fit

Co-authored-by: Lucas Jouin <[email protected]>

jinja2/qfdmo/carte/panels/legend.html

@@ -40,6 +40,6 @@ <h2 class="fr-h4 fr-my-2w">
         type="button"
         data-action="click -> search-solution-form#toggleAPropos"
     >
-        À propos
+        Infos
     </button>
 </aside>