Apologies for the delay.
a. Go to WP Admin - Plugins - Add new and install the Loco translate plugin.
b. Once installed, go to WP Admin - Loco translate - Locate the Vibe Course module plugin en_US.po file
c. Once clicked you'll see the translation interface (refer
screenshot), click on "Sync" button and then search for the string Price Options +, you can then translate it to your custom value and save. Once saved the translations will appear.
Optionally you can deactivate the plugin after applying your custom translations.
refer
screenshot