further implementing of multilanguage

language.php

@@ -13,13 +13,15 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-$lang = "de-de";
+require_once("config.php");
+$lang=$config["defaultLanguage"];
+
 if(isset($_GET['lang'])){
 	$lang = filter_var($_GET['lang'], FILTER_SANITIZE_STRING);
 }
 $lang_file = dirname(__FILE__) . "/lang/lang.".$lang.".php";
 if (!file_exists($lang_file)) {
-	error_log("Translation for " . $lang . " not found. Fallback to 'de-de'");
+	error_log("Translation for '" . $lang . "' not found. Fallback to 'de-de'");
 	$lang = "de-de";
 }
 require_once($lang_file);