Update ja.json Improvement of Japanese translation

[satopian]

"Tool options": "ツールオプション",
    "Brush size": "ブラシサイズ",
    "Opacity": "不透明度",
    "Color": "色補充", 
    "Blend": "混色",
    "Spacing": "間隔",
    "Scattering": "散乱",
    "Smoothing": "手ぶれ補正",

Translated the tool option item "color" to "色補充".
However, hsv's color picker palette is I want to translate it as "カラー". The "カラー" is the Japanese of the English word "color".

[sakots]

This one is very important because many of my translations were word-for-word translations of parts of the text that I had not actually used.

[thenickdude]

That sounds good about the adjustment of "Color", should I make that change too?

[satopian]

I checked the paint apps I use often. ChickenPaint's "color" is In that app It was "color amount".

[thenickdude]

I've updated the translation now to make it look like this

[satopian]

Thank you for adopting the translation.