This mod was requested by a friend and is really simple.
It provides one new item tooltip: The Item's Identifier (for example "minecarft:dirt" for dirt)
and adds a new chat command:

"/TranslateID" - can also be written as "/translateid", "transid", "translateitem", "transitem"
It has three way to be used:
1. "/translateid <id>" - Use a valid id of an item here to get the Identifier
2. "/translateid <identifier> - Use a valid identifier (ModID:Itemname) - or (Minecraft:Itemname) [CASE SENSETIVE]
3. "/translateid" - If sued without arguments it will give you both, the ID and Identifier of the item you currently have in your hands

I know this mod does not do much, but was requested and easy to use.
So I thought to do it properly and maybe there is someone else out there who needs this.