fix the alert if there are no Uptime API keys
init i18n library
init french and dutch translation
rename translations file to support more languages set in navigator
add option to disable language support
add languages in bottom navigation bar
add example translation
Merge branch 'feature/language-support' into develop

* feature/language-support:
  add example translation
  add languages in bottom navigation bar
  add option to disable language support
  rename translations file to support more languages set in navigator
  init french and dutch translation
  init i18n library
  fix the alert if there are no Uptime API keys
add a contributing guide, and update readme