update

src/context/locales/en.js

@@ -301,7 +301,7 @@ export default {
             wait_for_end: 'Awaiting end',
             not_started: 'Not started',
             not_completed: 'Not completed',
-            btn_pre: 'Pre',
+            btn_pre: 'Previous',
             btn_next: 'Next',
             btn_done: 'Done',
             btn_set_and_next: 'Set and next',