Gh pages l10n

[jamjan]

In order to add new language

• Add new index (language_code) to l10n.languages in _config.yml file.
• Update document index list in defaults in _config.yml file.
• Translations are organized by language code as t.{{l10nCurrentPageLanguageCode}}.index in _config.yml file.

Notes:

• Sites in default language should use new l10n-link tag otherwise corresponding translated pages will not be found.
• Variable l10nCurrentPageLanguageCode keeps the current page language which is taken from page.l10n-language
• Translated pages should use l10n-link and l10n-language tags.
• The famfamfam flags images are kept in ./public/assets/images/flags/.
• Translated documents could be kept in /<language_code> directory.
• If page.l10n-language is not present then it defaults to l10nDefaultLanguageCode