Thtas not really a bug, but before the language changes all words were started with a upcase letter. Now all things are lower case.
For example
now: "indian"
371: "Indian"
And the string "upgrade_spear_weapons" is turned into:
now: "upgrade spear weapons"
3.7.1: "Upgrade Spear Weapons"
I think with upcase letters it is easier to read adn it looks better.