install i18n gem
Config locale via I18n.locale
I18n-ify general words
fix URL escaper when making back-related links so that it works for non-Latin chars
improve localized server instruction
when building back link, separate page name and fragment to avoid ‘#’ being escaped
Merge branch 'i18n' of https://github.com/rails-taiwan/railsbridge-docs into rails-taiwan-i18n
Restore _escaped function to using URI::PATTERN::RESERVED

This ensures that the issue with colons in page links
(like on the Ruby site) still works, though it possibly
breaks non-ASCII page names.