This is the most common fix for versions that default to Russian or other languages without an in-game toggle.
Ensure that all .fcl , .bundle , and .lhd files are moved into a subfolder named bundles (case-sensitive). Method 3: Platform Settings Terminator Salvation English Language Patch
A fan-made exists for the PC version, primarily to restore the original English voiceovers to non-English releases (especially the Russian version). This patch typically: This is the most common fix for versions
With a terrible story accompanied by horrific gameplay, this is not a good Terminator game nor is it even a good action game. gamingpastime.com Q & A - Terminator Salvation Guide - IGN Terminator Salvation English Language Patch