[TwitterAPI] error_msg to simplify to handle in frontend
[TwitterAPI] error_msg to simplify to handle in frontend

ryota-murakami/daily-tweet,ryota-murakami/daily-tweet,ryota-murakami/tweet-pick,ryota-murakami/daily-tweet,ryota-murakami/tweet-pick,ryota-murakami/tweet-pick,ryota-murakami/daily-tweet