Make renderer options item enabled/disabled instead

Also a missed French translation

src/qt/qt.c

@@ -54,8 +54,6 @@ plat_vidapi(const char *api)
         return 4;
     } else if (!strcasecmp(api, "vnc")) {
         return 5;
-    } else if (!strcasecmp(api, "qt_opengl3_pcem")) {
-        return 6;
     }
 
     return 0;
@@ -85,9 +83,6 @@ plat_vidapi_name(int api)
         case 5:
             name = "vnc";
             break;
-        case 6:
-            name = "qt_opengl3_pcem";
-            break;
         default:
             fatal("Unknown renderer: %i\n", api);
             break;