(DC) Add entry to tooltip

Go to System tools → ConfigManager → Digizuite™ DAM Center → 4.0.0 → [Newest version]
Press Searches and then GetAssets
Press "Output"
Press "Add"
(Usually) Press "Table and column". In table usually input "asset", and in column choose your value.
Usually you don't put in a return type, as it will default to string. In older searches, there has been used string - which is why the UI might contain string as return type.
Wing off the "Tooltip?"
Press "Add a user defined attribute"
Type in "columnWidth : 1"
Repeat this action 2 more times and add: "isColumn : true" - and then "labelConstantId : valueX" - where X is something unique - usually the field name is the one that's chosen - e.g. valueUploadName.
(Optional) Copy the labelConstantId to make it easier to create a label in the upcoming steps (The valueX)
Press "Create"
Press "Save" for the search (Not the entry)
(Maybe delete this entry) Maybe you have to regenerate the search
Press Labels
Press ValueFields
Press "Add label"
In the new entry that appears, add the labelConstantId in the "Constant" and in the "Label" input the text you want it to have in your currently chosen language (If nothing else is shown, you're most likely editing English) Remember to give a Label text for each language.
Press somewhere else on the page, for the "Save" button to be enabled
Press "Save"
Press "OK"
(Sometimes necessary) Recycle of DC through the IIS (Failing to do this, will result in your changes not being applied) - Sometimes you only need to refresh the page.
Go to the an asset overview - or just search for anything in the top right search bar.
Hover an asset, and look at its tooltip - the label with your data you added some steps back should now be available in your language.