Bootstrap bug report

Example

Normal English situation:

โ˜€๏ธ๐ŸŒค๐ŸŒฅ๏ธโ˜๐ŸŒงโ›ˆ๏ธ

Chinese situation:

โ˜€๏ธ๐ŸŒค๐ŸŒฅ๏ธโ˜๐ŸŒงโ›ˆ๏ธ

Simulation

There are some examples that simulate the situations when using Noto Sans CJK or Source Han Sans as sans-serif.

Native font stack:

โ˜€๏ธ๐ŸŒค๐ŸŒฅ๏ธโ˜๐ŸŒงโ›ˆ๏ธ

Suggested fix:

โ˜€๏ธ๐ŸŒค๐ŸŒฅ๏ธโ˜๐ŸŒงโ›ˆ๏ธ