INTERLIS Export Selection of object not possible with German project

[sjib]

Describe the bug
When having a project file in another language than English, where vw_qgep_reach is named vw_qgep_haltung - resp. vw_qgep_abwasserbauwerk instead of vw_qgep_wastewater_structure - the selection is not working

To Reproduce
Exact steps to reproduce the behavior:

1. Go to layer vw_qgep_Haltung
2. Select some reaches with the Selection tool or a filter
3. Click on the INTERLIS Export button
4. Limit to selection show 0 structures and 0 reaches instead of the number of selected objects

Expected behavior
Selection should also work with German and French (and all other translated) files
Or at least a warning should be displayed that the needed layer is not available

Screenshots / data

It looks like the layer names are hardcoded in the INTERLIS Export:

qgepqwat2ili/qgepqwat2ili/gui/gui_export.py

Line 21 in c749775

structures_layers = QgsProject.instance().mapLayersByName("vw_qgep_wastewater_structure")

qgepqwat2ili/qgepqwat2ili/gui/gui_export.py

Line 27 in c749775

reaches_layers = QgsProject.instance().mapLayersByName("vw_qgep_reach")

Current workaround
Use an English project file for the export of a selection.

Possible improvement

• Adapt code so that layer name references also check for translated layer names.
• Add these translation to the config

or maybe even better

• Check source instead of layer name for vw_qgep_wastewater_structure / vw_qgep_reach - this would not need to know the name of the layer itself
  

• Check code where else layer names are hardcoded. May be it also influences the label export.

Desktop (please complete the following information):

• QGEP plugin version 1.5.6
• QGEP datamodel version 1.5.5
• QGEP project file version latest
• QGIS Version 3.23
• OS Windows 10

Additional context
Add any other context about the problem here.

[sjib]

If you choose "Export labels" an error message is displayed when the layer is not found:

"Could not find the vw_qgep_wastewater_structure and/or the vw_qgep_reach layers.",

qgepqwat2ili/qgepqwat2ili/gui/__init__.py

Line 226 in c749775

if len(structures_lyrs) == 0 or len(reaches_lyrs) == 0:

-> Should be displayed in any case if layer is not found in project.