more spelling fixes

WEBROOT/config.php

@@ -375,4 +375,4 @@ $linkButtons = array (
     'adminOnly' => false,
     'group' => 'tools',
   ),
-);
+);

WEBROOT/controller/DatabaseConnect.php

@@ -56,7 +56,7 @@ function db_connect() {
     } catch (mysqli_sql_exception $e) {
 
         sendMail(
-            "Database connection failed",
+            "ERROR: Database connection failed",
             $e->getMessage(),
             (new getSpecificData())->getRequestURL(),
             false

WEBROOT/modules/Mail.php

@@ -14,7 +14,7 @@ function sendMail($subject, $message, $url, bool $log) {
     if ($log == true) {
         DatabaseInsert(
             "Mailing",
-            "Datum, SUBJECT, MESSAGE, URL, CLIENT_IP",
+            "DATUM, SUBJECT, MESSAGE, URL, CLIENT_IP",
             (new getSpecificData())->getRequestTime(),
             $subject,
             $message,