All: Resolves #6266: Filter keywords casesensetive

[JackGruber]

Fixes #6266 that only lowercase keywords work in the search filters.

I wanted also convert the SearchFilter.test.js to TypeScript, but unfortunately I can't manage the following line.
Parameter 'a' implicitly has an 'any' type.ts(7006) const ids = (array) => array.map(a => a.id);

[laurent22]

I can't manage the following line.
Parameter 'a' implicitly has an 'any' type.ts(7006) const ids = (array) => array.map(a => a.id);

It would be fine to leave it as "any" in this case, it's still better than having a JS file. The proper way would be to define the interface that this function accepts, which is something generic like interface ObjectWithId { id: any; } ("id" can also be "any" because it's a generic function that could work with any type of ID). Then const ids = (array:ObjectWithId[]) ....

[JackGruber]

Tanks for the hint

[laurent22]

Looks good, thanks for the fix @JackGruber!