2.19.3 — Czech, Japanese and Russian in the language picker

Surface the community translations that landed via Weblate but were never
listed in locales_config.xml. European Portuguese stays out: it has one
translated string.

app/src/main/res/xml/locales_config.xml

@@ -10,11 +10,14 @@
 <locale-config xmlns:android="http://schemas.android.com/apk/res/android">
     <locale android:name="en" />
     <locale android:name="ar" />
+    <locale android:name="cs" />
     <locale android:name="de" />
     <locale android:name="es" />
     <locale android:name="fr" />
     <locale android:name="it" />
+    <locale android:name="ja" />
     <locale android:name="pl" />
     <locale android:name="pt-BR" />
+    <locale android:name="ru" />
     <locale android:name="zh-CN" />
 </locale-config>