Timeline i18n

Summary

• Add i18n for existing timeline sources
• Add I18nText wrappers to timeline entry widget

🗞 Think Big i18n strings will be removed once the source no longer exists.

Description

The new JSON format for timeline sources works as follows:

• Top-level sources (those that are shown in timeline settings) require a .title and .description attribute
• The remaining keys are for the titles of sub-sources (e.g. "Think Big - Comments" < "Think Big") which require no description

"sources": {
    "editorial_dept": {
        "title": "tinyCampus editorial department",
        "description": "tinyCampus editorial department main information channel",
        "general": "General",
        "important": "Important information",
        "events": "Events"
    },
    "qanda": {
        "title": "Questions & Answers",
        "description": "Posts from the \"Questions & Answers\" module"
    },
    "thinkbig": {
        "title": "Think Big",
        "description": "Everything about the \"Think Big - Build Small\" conference",
        "comments": "Think Big - Comments"
    }
},