Used built in Zotero localisation for item type

[PhilipMottershead]

Added localization support for ItemTypes to fix #65

Further work is need to localise parts of the output

[argenos]

This should definitely be optional!

[PhilipMottershead]

So a option in the menu if they wan't tags to folllow the system locale for item tags?

[PhilipMottershead]

As if a translation is missing it will default to english this will only work if they change thier locale in which I expect they would want their native language to be exported

[argenos]

yeah, I think a hidden preference for this would suffice. Something along the lines of extensions.mdnotes.localize_fields (true/false).