v0.50.0

• Calculated gallery image size with JS to avoid using length from Handlebars, which may cause incompatibilities with other Handlebars implementations.
• Fixed missing product description.
• Improved structure of i18n helper, in particular:
  • Moved and renamed /locales to /input/i18n
  • Renamed translations.yaml to main.yaml
  • Explicitly put bundle main in templates to help editing