Make Language change specific to window/app not whole system (Windows 8.1)
Control Panel - Language - Advanced Settings - Let me set a different input for each app window
Noticing there's no reply re. Windows 10 (which was my problem and the reason I reached this forum), here are the setting to make language input application-specific in Windows 10:
Start > Settings > Time & Language > Region & language > Additional date, time & regional settings > (under Language) Change input methods > Advanced settings > (under switching input methods) Let me set a different input method for each app window
Good job Microsoft, I don't think you could have hid this any better :p
In my Windows 10, I do not have the Change input methods, so here is another flavor to make Windows remember the language input.
Start > Settings > Time & Language > Region & language > Advanced keyboard settings > Let me use a different input method for each app window.
You can simply type "advanced keyboard settings" in the start menu to reach it instantly.