This update removes obsolete code from the India localization module that no longer served any purpose. It helps keep the product easier to maintain without changing current business workflows or user-facing behavior.

both methods don't exist anymore and not used

This update removes code in Odoo's core data layer that could no longer be reached in normal operation. It has no expected impact on day-to-day users, but helps keep the system simpler and easier to maintain.

get_trans_func is only used  when  self.translate is callable

Then only place where get_trans_func is used: 
https://github.com/odoo/odoo/blob/fe376d5/odoo/models.py#L3071-L3072



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