A closer translation to light yellow is "jaune clair" in French.

"The shoes are light yellow" accepted 10/2/2019

Colors are a bit tricky in French. When you have a modified color, it becomes invariable. This means that you don't alter it to account for gender or number.

Example:
Les livres sont vert foncé. (dark green)
Nos clés sont gris clair. (light gray)
Mes fraises sont rouge foncé. (dark red)

Basically when you have two words in a row describing the color, the words stay singular and masculine.

Here's a good site that addresses this issue: https://www.thoughtco.com/invariable-french-adjectives-1368796

I'm not sure but I think that only applies if you'd say "the pale yellow shoes", but since it's "the shoes ARE pale yellow" that's not needed (maybe because it's already implied that they are plural thanks to the plural form of "are")

Agreed. The only place I've heard "pale" in the context of color is on BBC, so maybe Brits make the distinction? But colloquially in the United States, one would say "light yellow" in this context. That isn't to say "pale" would be wrong in the U.S. nor to say it's never used, but "light" is more common.

Colors that have been modified by another word like (pâle, clair, foncé...) become invariable. They don't form agreements with the noun they describe.

So it is always:
jaune pâle
rouge foncé
gris clair