Create a shared localization module to use throughout the code
Move to new localization module and prepare to deprecate built in localization functionality
Rename internal localization to :internal instead of :self
Support localization of convert_misc_characters
Support localization of convert_miscellaneous_html_entities
Tidy up a bit
Support localization of convert_vulgar_fractions
Merge pull request #90 from lassebunk/localized_conversions

Support localization throughout the code