Japanese text input not working correctly

[andreas-ku]

Hi,

I noticed that the datasheet is not handling Japanese input correctly on Mac (both in Firefox and Chrome). Have not tested for other operating systems

To reproduce

1. Go to system preferences > language & region > Keyboard preferences
2. Click on "+"
3. Add "Japanese - Romaji"
4. Choose "Hiragana" as input source in the top bar
5. Go to https://nadbm.github.io/react-datasheet/
6. Click on a cell
7. Press the letters "k" and "o"

Expected

Should show the Japanese Character "こ"

Actual Result

Shows "kお"

[greenaaaa]

Hi @nadbm Click to input Chinese, which can also be reproduced. Could you please take a look?