add simple text to recovery UI

- recovery takes a --locale argument, which will be passed by the main

- the locale is saved in cache, in case the --locale argument is
  missing (eg, when recovery is started from fastboot)

- we include images that have prerendered text for many locales

- we split the background states into four (installing update,
  erasing, no command, error) so that appropriate text can be shown.

Change-Id: I731b8108e83d5ccc09a4aacfc1dbf7e86b397aaf
diff --git a/screen_ui.h b/screen_ui.h
index 34929ee..16ee741 100644
--- a/screen_ui.h
+++ b/screen_ui.h
@@ -57,7 +57,8 @@
     int installingFrame;
     pthread_mutex_t updateMutex;
-    gr_surface backgroundIcon[3];
+    gr_surface backgroundIcon[5];
+    gr_surface backgroundText[5];
     gr_surface *installationOverlay;
     gr_surface *progressBarIndeterminate;
     gr_surface progressBarEmpty;
@@ -92,6 +93,7 @@
     int indeterminate_frames;
     int installing_frames;
     int install_overlay_offset_x, install_overlay_offset_y;
+    int overlay_offset_x, overlay_offset_y;
     void draw_install_overlay_locked(int frame);
     void draw_background_locked(Icon icon);
@@ -104,7 +106,7 @@
     void progress_loop();
     void LoadBitmap(const char* filename, gr_surface* surface);
+    void LoadLocalizedBitmap(const char* filename, gr_surface* surface);
 #endif  // RECOVERY_UI_H