Add high-order func description and update out-of-data badges

[GreasySlug]

The term was mentioned but not actually written. Have the Japanese corrected, and then translate it into English.

Changes proposed in this PR:

• [x] Description of high-order func/proc in JA
• [x] Description of high-order func/proc in EN
• [x] Update func/proc badges

I'd better update the badges anyway, so I'll include them in this.

• [x] update out-of-data badges in JA
• [x] update zh_CH in syntax
• [x] update out-of-data badges in zh_CN in syntax
• [x] update zh_TW in syntax
• [x] update out-of-data badges in zh_TW in syntax

@mtshiba