Implement adaptive Android shell and safe navigation (#102)

android/features/src/main/res/values/strings.xml

@@ -113,4 +113,9 @@
     <string name="search_count">Results: %1$d</string>
     <string name="search_open">Open entry</string>
     <string name="search_cancelled">Search cancelled. Refresh to try again.</string>
+    <string name="shell_appearance">Appearance</string>
+    <string name="shell_appearance_system">System default</string>
+    <string name="shell_appearance_light">Light</string>
+    <string name="shell_appearance_dark">Dark</string>
+    <string name="shell_refresh">Reload state</string>
 </resources>