[5.3] db prefix

[brianteeman]

The error message if you enter an invalid db prefix is not clear that it MUST end with an underscore

Testing Instructions

Use the web installer and set a db prefix of abc

Use the cli installer and set a db prefix of abc

Actual result BEFORE applying this Pull Request

Expected result AFTER applying this Pull Request

Link to documentations

Please select:

• Documentation link for docs.joomla.org:

• No documentation changes for docs.joomla.org needed

• Pull Request link for manual.joomla.org:

• No documentation changes for manual.joomla.org needed

[alikon]

I have tested this item ✅ successfully on f2be72f

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[richard67]

I have tested this item ✅ successfully on f2be72f

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[richard67]

RTC

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[rdeutz]

Thanks

[Kostelano]

Please add the appropriate version of milestone

[brianteeman]

@rdeutz can you add the milestone please

[richard67]

Done

[brianteeman]

thanks @richard67 and also to @tecpromotion for correcting some others