Theme control panel options values can be translated in admin strings translation in WPML plugin.
- Go to WPML > String translation.
- Scroll page down and click Translate texts in admin screens » link.
- Scroll page down or search for PANEL on page (CTRL+F in browser open search dialog). You should see your theme panel translation section (for example if you use Barrel theme you will see BARREL_PANEL section). Here you can enable theme control panel strings for translation (usually all strings should be already enabled by theme WPML config file):
- Click Apply button.
- Now you can translate this admin panel strings in WPML > String Translation as usual.