Fix return of property field.

[xt0ph]

No description provided.

[coveralls]

Coverage remained the same at 73.02% when pulling 6ee4e87 on 2cadz:3.2 into 2f9ffed on openlabs:3.2.

[sharoonthomas]

@mbehrle could you take a look at this patch please ?

[mbehrle]

Of course, will do ASAP. As we already discussed, originally this didn't work for me, but I will have to check again.

[mbehrle]

Confirming, that this PR is the correct solution. I was initially misguided by

Traceback (most recent call last):
...
return super(Translation, self).unique_key()
TypeError: 'tuple' object is not callable

but now looking at it it is more than clear...;)

Please merge.

[sharoonthomas]

Thank you @mbehrle 👍

[sharoonthomas]

Thank you @2cadz for the PR and fixing the issue.