translate-attr is not getting interpolated with translate-value-some-var directives

[jakefreeberg]

If you use the translate-value-something directive, your values don't get in to the translate-attr keys. Works fine with if you stick with translate-values, but we prefer the translate-value-syntax, if we can use it.

Environment

• version of angular-translate: v2.13
• version of angular: v1.4.8
• which browser and its version: Chrome 53 Mac

Steps to reproduce

Here's a simple plnkr to prove it: https://plnkr.co/edit/H72uqf

Expected behaviour

translate-value-something="{{ thatThing }}" should work exactly like
translate-values="{'something': thatThing}"

Actual behaviour

The interpolated values from translate-value-var are not available to the translate-attr directive.

[jakefreeberg]

I think I see how I might implement this but let me run it past you:
Within the translate-attr directive, you're watching the translateValues attr for updates.
If I did an Object.getOwnPropertyNames(attr) and started watching anything that started with translateValue I should be able to feed those values in.
Does that sound about right?
I've had no 👍 on this so I'm not sure its worth the effort, but I'd live to give a little back here so I may do it.

[knalli]

@jakefreeberg Yeah, the directive angular-attr is missing support for the translate-value-xyz attributes. Overseen..

[knalli]

Maybe the internal should be adapted like in the translate directive..