Added rule for account.idm.telekom.com

[hatobi]

Added a rule for password-change site of t-online.de as well as telekom.de – they both use the same subdomain for password-changes as well as the same password rules.

Rules have been tested using passwords generated by the password rules validation tool.

Overall Checklist

• I agree to the project's Developer Certificate of Origin
• The top-level JSON objects are sorted alphabetically
• There are no open pull requests for the same update

for password-rules.json

• The given rule isn't particularly standard and obvious for password managers
• Generated passwords have been tested from this rule using the Password Rules Validation Tool
• Information has been included about the website's requirements (eg. screenshots, error messages, steps during experimentation, etc.)
• The PR isn't documenting something that would be a common practice among password managers (e.g. minimal length of 6)

[rmondello]

Were you able to test that all special characters are supported? Usually websites do not support all special characters, even if they say they do.