fps-importer: allow setting

packages/fps-importer/template/problem_import_fps.html

@@ -9,6 +9,9 @@
             <input type="file" name="file">
             <input type="submit" value="{{ _('Upload') }}" class="rounded primary button">
           </p>
+          <p>{{ _('problem.import.fps.hint1') }}</p>
+          <p>{{ _('problem.import.fps.hint2') }}</p>
+          <p>{{ _('problem.import.fps.hint3') }}</p>
         </form>
       </div>
     </div>