Add localization keys for frontend tokens to Classic Theme

• Type: Story
• Status: Closed
• Priority: Minor
• Resolution: Completed
• Affects Version/s: None
• Fix Version/s: Master
• Component/s: Liferay Themes, Liferay Themes > Classic
• Labels: None
• Epic Link: fi-theme-styles-support
• Git Pull Request: https://github.com/liferay-frontend/liferay-portal/pull/159

This is the final LPS for bringing L10N to the frontend tokens of Classic Theme. It will add the Language.properties file with the translations and the OSGi headers needed to make it usable.