[Resuelto] Translates strings in customised plugin

Background of the issue:
We have set up our own WordPress plugin where we want input fields to be translated depending on which language you are in. We have set up a wpml-config.xml page with this information: We have done a string translation but still it fails to print out correctly.

Symptoms:
The translated strings in the custom plugin are not displaying correctly.

Questions:
Why are the translated strings in our custom plugin not displaying correctly?
Is there an issue with our wpml-config.xml setup for translating input fields?