Updated translations, snap-to-roads function on client side

This release contains:

• updated translations to Spanish language
• added translation to the Persian language
• added new period drop-down list, which allows to quickly select period for archive generation (like day, week, month, etc.)
• improved snap-to-roads function. Now it runs on client side and what's more important loads track geometry
• URLs to resources are updated to be relative to the deployment path. It allows to deploy service to non-root (i.e. '/') URL

Please note that this is not the final version and it was released due to lots of questions about next release. It does not contain everything I planned to include.