v2.6.0

This release also ships 2.5.0, which was not published on its own: about
twice as many words in every theme, and words that almost never repeat
within 50 subjects (see CHANGELOG.md).

Added

• Chinese (中文): a third language in the top bar, in Simplified Chinese.
  The six themes exist in Chinese (奇美拉, 建造者, 达尔文, 奇幻, 好莱坞动作片,
  都市), with as many words as in English and 35 to 101 sentence shapes. The
  interface, the subject counts (418万亿) and the timer voice are translated.
• Every Chinese noun comes with its measure word (一只狼, 一条龙, 一座城堡),
  and the measure word follows the noun when you reroll or lock it.
• If no system voice speaks the language of the subject (a Chinese subject on
  a Windows without a Chinese voice), 3CH says so once instead of staying
  silent. Windows: Settings → Time & language → Speech → Add voices.
• For theme authors: [.field@a] shows a field of the word in slot a (the
  measure word in Chinese), and npm run sample checks Chinese themes.

Changed

• The robot voice picks the main voice of a language first (zh-CN before
  zh-HK or zh-TW, fr-FR before fr-CA).
• Subject counts such as 9.97 million now read "10 million", not "10.0
  million".