OS - Android 4.4.2 
Phone - Huawei Honor 6 
UI - EmotionUI 2.3

I want to add additional language (Tamil language) under **Settings - Language & Input - Language**, how can I add it?

If I could add Tamil, I could use that in 'Google Handwriting Input'. Or Is there any other way to install Tamil language, so that I could write in Tamil with Google Handwriting Input?

Earlier, I set up 'Swype for Huawei' as default keyboard, long pressed in space bar, selected 'More Languages' 'Download languages', downloaded and installed Tamil, but I could use this only in 'Swype for Huawei' keyboard, not in other 
keyboards.