Mark translatable strings in Markups module

[idrissa10]

• [ ] Markup type names in markups module are not translated

[idrissa10]

https://github.com/idrissa10/Slicer/commit/90fd711b10e0f7a75505eeef5fb9561e3ac6c558

[lassoan]

Thank you, I had a quick look at the referenced commit and it seemed all right. Please submit a pull request when it's ready for review.

[lassoan]

After making markup type translatable, make sure these extensions can be build with both the old and new version of the Markups node:

• https://github.com/chir-set/SlicerExtraMarkups
• https://github.com/SlicerHeart/SlicerSurfaceMarkup

#define TRANSLATABLE_MARKUP_TYPE 1 could be added to vtkMRMLMarkupsNode.h and then in the extension you can add

#ifdef TRANSLATABLE_MARKUP_TYPE 
...
#else
...
#endif

to specify code that works with the old/new version.