Repro steps:
1) Add Japanese-Kana keyboard in your iPhone settings
2) Open, build and run the project on an iPhone
3) Change the keyboard to Japanese and try clicking the Emoticon button(screenshot1) - nothing happens
4) After writing something, the Emoticon button should change to another one, which adds something to the letters(screenshot4)
5) On iOS 7 it adds nothing
6) Click the Latin letters button (screenshot2)
7) Try writing something and clicking a/A button(screenshot3), which should make them upper/lower case - nothing happens

Expected behaviour: all buttons do what they are meant to do

Workaround: use auto-correct suggestions, write emoticons by hand

Reproduced in: 5.4.0b16; 5.3.4p4; 5.2.4f1