Simplified Chinese and Russian Translations. SHA256 hash. Detached sig.

• Japanese translations for Split Wallet. Thanks dabura667.
• remove promise to show MINI key on details tab. MINI key
  will only be shown when it is provided since it cannot
  be derived from other key formats.
• fix README
• Russian translations. Thanks e5faf2.
• Simplified Chinese translations. Thanks kwl01skz.
• add direct link to zip on github
• add this CHANGELOG to repository and add detached sigs in repository.
  add link to sig of HTML.
• hash with SHA256 instead of SHA1. SHA1 hash still provided in package.json.