Hello seeker,
It's good to know that you are interested in Translation diploma courses.
After finishing the 10+2 level, students can pursue a diploma in Translation. A certificate of competency in any language from a recognised university is necessary for this course.

So, here is a list of colleges which offer the samenear to Guntur, Andhra Pradesh :-
1. University Of Hyderabad, Hyderabad
2. Sri Venkateswara University, Tirupati
3. Andhra University, Visakhapatnam
4. School of Distance Education, Andhra University, Visakhapatnam

You can go with any, all are near to your location.
All the best.