The contentFormatter for ContentType:Json does not correctly format strings

[Styn]

When sending a string as json, it should by json.stringified, otherwise the backend is not able to parse it correctly.

I'll create a PR for this

[js2me]

Hello @Styn ! Thanks for your contribution !

[js2me]

@Styn please, use the next branch!

[Styn]

Oh sorry, I already created it, will try to fix

[Styn]

My previous commits seem to also be included in that PR, even though I created a new fork...

[js2me]

Fixed in 5.1.6