(whitelist): add .addwlu and .rmwlu commands with auto ID detection

[Alessandrx204]

Summary of changes

• Added two new functions in whitelist.py:

  • remove_whitelist_you → .rmwlu command
  • add_whitelist_you → .addwlu command
    These commands automatically add/remove the message receiver to/from the whitelist by extracting their user ID.

• Changed messaging behaviour:
  Many commands now edit the original outgoing message instead of replying, in order to reduce spam.

• Updated translations:

  • Added new strings to support the above features.
  • made German and Italian localisations of new strings.
  • Other languages still use English placeholders for the new strings.

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