ColorPicker's one string was placeholder="Font Weight" on an <input type="color">,
where a placeholder is both wrong text and inert — browsers do not render one on a
colour input. Keyed it as ui.colorPicker.placeholder and moved it to the hex text
field beside it, which is a real text input and had none. Translating it in place
would have created a key guaranteed never to be seen.
Both files still have no importers; CommandBlock stays because commands the user
might run need a copy button by convention.