Project template new params

[mauretto78]

ASANA
https://app.asana.com/0/1134617950425092/1208135944820387
https://app.asana.com/0/1134617950425092/1208135944820383

NEW TEMPLATE PROJECT PROPERTIES

The three new template project properties are summarized in the table here:

parameter name	type	required	default value	validation	saved in/as
subject	string	no	null		project subject
source_language	string	no	null	is a valid language	job source language
target_language	array	no	[]	is an array of valid languages	job target language(s)

USER METADATA

To save or update a user metadata call this new endpoint:

PUT /api/v2/user/metadata

With the following JSON payload:

{
     "key": "your-key",
     "value": "the-value"
}

A response like this will be returned:

{
     "id": 12,
     "uid": 134,
     "key": "your-key",
     "value": "the-value"
}

If the key already exists, the metadata will be updated.

[piedicianni]

FE dependency: #3573