Add automatic Per App Languages

Signed-off-by: Arthur-GYT <a.gayot@posteo.com>

app/build.gradle

@@ -98,6 +98,9 @@ android {
     namespace 'com.owncloud.android'
     testNamespace "${namespace}.test"
 
+    androidResources {
+        generateLocaleConfig = true
+    }
 
     defaultConfig {
         minSdkVersion 24

app/src/main/res/resources.properties

@@ -0,0 +1 @@
+unqualifiedResLocale=en-US