md-text-float doesn't accept expression as label

[iasandcb]

For example,

<md-text-float label="{{questions}}" ng-model="score"></md-text-float>

shows nothing for label.

[KevinGaudin]

I'm trying to use angular-translate to display translated labels in md-text-float and meet the same issue.

<md-text-float label="{{'QUESTIONS_PER_ROUND'|translate}}" ng-model="nbQuestions"></md-text-float>

The result is:

<md-input-group ng-disabled="isDisabled" label="Questions par tour:" ng-model="nbQuestions" class="ng-isolate-scope ng-valid md-input-has-value ng-touched" type="text" tabindex="0" aria-invalid="false">
    <label for="" class="ng-binding">QUESTIONS_PER_ROUND</label>
    <input id="" ng-model="value" tabindex="0" type="text" aria-invalid="false" class="ng-valid">
</md-input-group>

So the label in the md-input-group is correctly translated but the label subelement did not receive the translation.

[KevinGaudin]

After reading the source code I understand that md-text-float is pretty limited for the moment, I needed ng-change on the input fields too and it's not supported. For the moment I'm using directly the md-input-group + label + input and it's nice.