adding äÄöÖüÜߧ²³°´? to allowed chars in sql play ground (#1647)

adding äÄöÖüܧ²³°´ to allowed chars in sql play ground

Co-authored-by: Sven Roman Reinhard <sven.roman.reinhard@mni.thm.de>

modules/fbs-core/web/src/app/page-components/sql-playground/sql-input-tabs/highlighted-input/highlighted-input.component.ts

@@ -146,7 +146,7 @@ export class HighlightedInputComponent
 
     // allow only caracteres for valid sql query
     text = text.replace(
-      /[^a-zA-Z0-9\(\)\[\]\{\}\s\.\,\;\=\+\-\*\/\>\<\!\@\#\$\%\^\&\_\~\`\:\'\"\|\\]/g,
+      /[^a-zA-Z0-9üöäÄÖÜß\(\)\[\]\{\}\s\.\,\;\=\+\-\*\/\>\<\!\@\#\$\?\%\^\&\_\~\`´°²³§\:\'\"\|\\]/g,
       ""
     );