Labels are normally static presentation texts. These texts can be translated by following the strategy described here.

From time to time, however, you may want to use data instead of static texts.

Column Headers in Grids

Expressions for labels in a grid are found at the level of the grid root column, taking the name of "GridRootColumnName"_"GridColumnName"_Label

Labels for Widgets and Buttons

Expressions for labels on simple widgets are found at the same level, taking the name of "ColumnName"_Label

And for MVC and AngularJS: