HTC One E8 - Manual (Page 179)

TalkBack language settings
1. Go to Settings, and then tap Accessibility.
2. Tap Text-to-speech output > Google Text-to-speech Engine, and do one of the following:
Select a different
language Tap Language.
Install a voice Tap Install voice data, and then tap the language. Tap next to
the voice data you want to install. When installation is completed,
press
twice and tap Language.
3. Select the language you want to use.
Not all languages are supported.
179 Settings and security