[Bug] Special characters not supported

[lagmoellertim]

I tried to login with my Untis-Username, but my lastname contains special characters, so i wasn't able to log in.

Error message: { jsonrpc: '2.0', id: null, error: { code: -32700, message: 'Parse error: Unexpected end-of-input: expected close marker for Object (start marker at [Source: org.apache.catalina.connector.CoyoteInputStream@266700cd; line: 1, column: 1])\n at [Source: org.apache.catalina.connector.CoyoteInputStream@266700cd; line: 1, column: 233]' } }