[Typo3] Install tool and database name check

[Michael Stucki]

Hi Albert,

> Trying to install a 3.8 from scratch I came across the following error:
> 
> Host 'database-6.db.widexs.nl' was not alphanumeric, a-zA-Z0-9_-:., or
> longer than 50 chars (...not saved)
> 
> which seems a bit harsh: this is a legal name for a server isn't it?
> Shouldn't the script let this pass ( the '-' in the name)?

Could be a bug. Please report it to the bugtracker, otherwise it might get
lost...

- michael
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