Hello,
First of all thanks for choosing our Theme, we are glad to be you in the WoodMart WordPress family :).
If you want to translate the theme in only one language then you need to install and use the loco translate plugin for that.
You can also watch the video in our detailed documentation in the following link: https://www.youtube.com/watch?v=D3NsDdMzsls
You can change the text of Shipping and Delivery Tab from Theme Settings >> Single Product >> Tabs.
Screenshot for Clarification: https://gyazo.com/f35fa003f78f1ee88bbd6dd81d831cb0
Best Regards