In Android, you can specify the texts in the default locale in res/values/strings.xml. Additional translations can be added for new languages in res/value
Steps to get all missing translations are :
enable lint error for missing translation in app level build.gradle
lintOptions {
abortOnError false
enable 'MissingTranslation'
}
add languages to compare inside default config of level.gradle (here english and hindi)
resConfigs "en", "hi"
right click on default strings.xml. Then Analyze -> Inspect Code