app: test on mac/ios/win

[obfusk]

Works

• [x] linux: firefox
• [x] linux: chromium
• [x] android: webview
• [x] android: firefox
  • tooltips work, but context menu also appears
• [x] ipad: safari
  • tooltips do not work (not that important, probably no way to fix)
  • doesn't remove original w/ japanese input + kana conversion (not that important, probably no way to fix)

Needs testing

• [ ] windows: edge
• [ ] macos: safari
• [ ] iphone: safari

Should work but untested

• [ ] windows: firefox
• [ ] windows: chrome
• [ ] macos: firefox
• [ ] macos: chrome
• [ ] android: chrome