EXFO FTB-2 - Manual (Page 98)

Setting Up Your FTB-2 and FTB-2 Pro
88 FTB-2 and FTB-2 Pro
Selecting the Language of Operation
7. Under Windows display language, tap Make this the primary
language.
8. When the application prompts you to log off, tap Log off now.
9. Once you see the lock screen, swipe it down to reveal the user
accounts.
10. Log to your user account.
The new language is now selected and you are able to switch from one
input language to another.
I
MPORTANT
On an FTB-2, when you select a language that you have installed
manually, the Windows interfaces do not switch to the selected
language. They remain in the language configured at time of
purchase. However, the EXFO applications are displayed in the
selected language (when available).