Initial partial localization.  fr, de, and es have most strings from v1.1.17
Fix bug in preferences and update locale strings.
Update readme translations.  Update readme installation instructions for Zotero Standalone.
Update readme.md as well
Update translations from BabelZilla
Updated es locale from BabelZilla
Merge branch 'localize'.  Add es, fr, and de locales to the previous version of Zutilo (no new functionality, just locales).
Bump version numbers and update README (translation credits).