Decide FirstWord behaviour (or make it configurable)

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Testcase: "User evtl. mit Auto" results in the username being "User evtl".

[f00f]

Current pattern accepts \w and space as part of the username.
This might be wanted behavior, depending on the definition.

[f00f]

Make this a club config option.

[f00f]

FirstWord supports both variants. What's left is to make it a config option (per team).