Android Lint: how to ignore missing translation warnings in a regional locale string file that purposely only overrides some default translations?

Question

Is it possible to translate some strings, but not all, in a separate resource file without Lint complaining about MissingTranslation?

For example: m

Answer 1

Lint supports partial regional translations, but needs to know what language the default strings are. That way, it can distinguish a partial regional translation from missing translations in a different locale.

To specify the locale in values/strings.xml:

Quote from the lint command-line tool, when running lint --show:

By default this detector allows regions of a language to just provide a
subset of the strings and fall back to the standard language strings. [...]

You can tell lint (and other tools) which language is the default language
in your res/values/ folder by specifying tools:locale="languageCode" for
the root  element in your resource file. (The tools prefix
refers to the namespace declaration http://schemas.android.com/tools.)

Source: https://android.googlesource.com/platform/tools/base/+/master/lint/libs/lint-checks/src/main/java/com/android/tools/lint/checks/TranslationDetector.java#88

Add the locale specification to your default language file, and you shouldn't get that error for en-rUS, but will still be informed of any other missing translations.