[FEATURE] Allow the word invalid

[loftwah]

Description

The word invalid is flagged by EddieBot, but it is an actual word used in JavaScript errors. I would change the wording but it would make describing the issue ambiguous.

Screenshots

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Additional information

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[christophermorin]

I had a go at this. Please ignore if changing the banned words list is frowned upon. Getting my feet wet with the whole open source contribution world. Thanks!

[loftwah]

There is only one way to find out.