MOBILE-4653 viewer: Duplicate string to avoid translation problems

Author: crazyserver

scripts/langindex.json

@@ -2717,9 +2717,9 @@
   "core.viewer.increasetextsize": "local_moodlemobileapp",
   "core.viewer.openreadingmodesettings": "local_moodlemobileapp",
   "core.viewer.readingthemeauto": "local_moodlemobileapp",
-  "core.viewer.readingthemedark": "local_moodlemobileapp/core.settings.colorscheme-dark",
+  "core.viewer.readingthemedark": "local_moodlemobileapp",
   "core.viewer.readingthemehcm": "local_moodlemobileapp",
-  "core.viewer.readingthemelight": "local_moodlemobileapp/core.settings.colorscheme-light",
+  "core.viewer.readingthemelight": "local_moodlemobileapp",
   "core.viewer.readingthemesepia": "local_moodlemobileapp",
   "core.viewer.showmedia": "zoom",
   "core.viewer.theme": "moodle",