More work on translations

[crosby-moe]

• fully map module names, descriptions, categories, and their settings
• missing lang entries are always logged in dev env, can be enabled everywhere with -Dmeteor.lang.debug=true arg
• categories & setting groups are now defined in kebab-case, SettingGroup data deserialization now uses Utils#titleToName for backwards compat with old data
• meteor.command.<name> -> command.<name>
• renamed keybind (duplicate) setting in BetterTooltips to open-contents-keybind
• renamed side-color (duplicate) setting in Nuker to breaking-side-color
• renamed line-color (duplicate) setting in Nuker to breaking-line-color
• empty strings in translation files are discarded
• does not crash and burn if unexpected json type is found ("example.test": 3)