Possible to disable untranslated resources warning?

yes and no.

no: you can not disable the warning

yes: a workaround is to include all your english texts also inside your translated resource folders. (as a consequence your prg file will become a lot larger)

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be aware that if you do not provide resource strings for your translated languages then the setting pages in Garmin Express will look awful because of this bug: forums.garmin.com/.../garmin-express-does-not-implement-fallback-to-default-language-english-resources

I did not provide any setting translations yet and did not copy the english texts to the localised folders as I just saw in my tests, that the fallback to the default langage works (on my android phone). I did not get any feedback yet about missing translations from any user yet, so the problem you mention may not be a big issue in real life as most people use their phone to set up a watchface, but still it's good to know.

With the new information it seems that I really need to copy the resources from the default language to all enabled languages to get rid of the errors and to support garmin express

Maybe there is a better solution, but this is how I did it:

I split the strings in resources/ (default language) into

- strings.xml : here are the strings that are only used in resources/ (default language). These strings are translated in other languages.

and

- strings-default.xml : here are the strings that should not be translated in other languages (e.g. app-name or app-version).

I then do it this way for the translations (e.g. resources-deu):

- strings.xml contains the translated strings

and

- strings-default.xml is a link to resources/

This saves me double data maintenance and eliminates the build warning.

Here is an example:

> tree -f resources
resources
├── resources/drawables
│   ├── resources/drawables/drawables.xml
│   └── resources/drawables/launcher_icon.png
├── resources/fitcontributions
│   ├── resources/fitcontributions/fitcontributions.xml
│   └── resources/fitcontributions/strings.xml
├── resources/settings
│   ├── resources/settings/properties.xml
│   ├── resources/settings/strings-default.xml
│   └── resources/settings/strings.xml
└── resources/strings
 ├── resources/strings/strings-default.xml
 └── resources/strings/strings.xml

4 directories, 9 files

> tree -f resources-deu/
resources-deu
├── resources-deu/fitcontributions
│   └── resources-deu/fitcontributions/strings.xml
├── resources-deu/settings
│   ├── resources-deu/settings/strings-default.xml -> ../../resources/settings/strings-default.xml
│   └── resources-deu/settings/strings.xml
└── resources-deu/strings
 ├── resources-deu/strings/strings-default.xml -> ../../resources/strings/strings-default.xml
 └── resources-deu/strings/strings.xml

3 directories, 5 files

You can add translatable="false" and the warning is gone