Android system per-app language preferences

build.gradle

@@ -69,6 +69,8 @@ android {
 
         testInstrumentationRunner "de.dennisguse.opentracks.TestRunner"
         testInstrumentationRunnerArguments clearPackageData: 'true'
+
+        resConfigs "ar", "bg", "ca", "cs", "da", "de", "el", "en", "es", "et", "eu", "fa", "fi", "fr", "ga", "gl", "hi", "hr", "hu", "in", "it", "iw", "ja", "ko", "lt", "lv", "mo", "ms", "nb", "nl", "pl", "pt", "ro", "ru", "sk", "sl", "sr", "sv", "th", "tl", "tr", "uk", "vi", "zh"
     }
     signingConfigs {
         nightly {

src/main/AndroidManifest.xml

@@ -68,7 +68,8 @@ limitations under the License.
         android:icon="@drawable/ic_launcher"
         android:label="@string/app_name"
         android:supportsRtl="true"
-        android:theme="@style/ThemeCustom">
+        android:theme="@style/ThemeCustom"
+        android:localeConfig="@xml/locales_config">
 
         <activity
             android:name=".publicapi.StartRecording"

src/main/res/xml/locales_config.xml

@@ -0,0 +1,47 @@
+<?xml version="1.0" encoding="utf-8"?>
+<locale-config xmlns:android="http://schemas.android.com/apk/res/android">
+    <locale android:name="ar"/>
+    <locale android:name="bg"/>
+    <locale android:name="ca"/>
+    <locale android:name="cs"/>
+    <locale android:name="da"/>
+    <locale android:name="de"/>
+    <locale android:name="el"/>
+    <locale android:name="en"/>
+    <locale android:name="es"/>
+    <locale android:name="et"/>
+    <locale android:name="eu"/>
+    <locale android:name="fa"/>
+    <locale android:name="fi"/>
+    <locale android:name="fr"/>
+    <locale android:name="ga"/>
+    <locale android:name="gl"/>
+    <locale android:name="hi"/>
+    <locale android:name="hr"/>
+    <locale android:name="hu"/>
+    <locale android:name="in"/>
+    <locale android:name="it"/>
+    <locale android:name="iw"/>
+    <locale android:name="ja"/>
+    <locale android:name="ko"/>
+    <locale android:name="lt"/>
+    <locale android:name="lv"/>
+    <locale android:name="mo"/>
+    <locale android:name="ms"/>
+    <locale android:name="nb"/>
+    <locale android:name="nl"/>
+    <locale android:name="pl"/>
+    <locale android:name="pt"/>
+    <locale android:name="ro"/>
+    <locale android:name="ru"/>
+    <locale android:name="sk"/>
+    <locale android:name="sl"/>
+    <locale android:name="sr"/>
+    <locale android:name="sv"/>
+    <locale android:name="th"/>
+    <locale android:name="tl"/>
+    <locale android:name="tr"/>
+    <locale android:name="uk"/>
+    <locale android:name="vi"/>
+    <locale android:name="zh"/>
+</locale-config>