Allow number attributes to be written with and without quotations

[thrbnhrtmnn]

Description / User Story

After fixing the show code function by changing the render function last Friday, we noticed with #819 that attributes that are numbers are not working. After some investigation by @ChristianHoffmannS2 and @bar-tay , we found out that currently numbers only work as attributes, when they are written without quotation marks. <input value=20> works, but <input value=“20”> does not currently work. We should find a way that numbers as attributes work both with and without quotation marks.

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Acceptance Criteria

• Numbers at attributes like the offset in the Tooltip component work with quotation marks
• Numbers at attributes like the offset in the Tooltip component work without quotation marks

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Background information

• Add relevant information here
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[ChristianHoffmannS2]

@bar-tay we actually planned to solve this during the pair programming session.

there is already a draft branch for that, including informations how far we got and whats left
#837

[thrbnhrtmnn]

As discussed with Christian today this task can be closed