**Problem:**
Instead of adding identical values for many languages, editors will soon be able to add a `mul` Label and Alias in the termbox. It is however not immediately obvious, that the `mul` entries will work as fallbacks. Editors will only see "No label defined" which might convince some editors to add the redundant Labels again. We need to make this more intuitive.
**Notes:**
* T332175 does the same thing on mobile
* In story writing, it was decided to split the original task into viewing (T329655) and editing (T338330).
* The reason is that we only allow the language code `mul` for Labels and Aliases and not for descriptions (T313027).
* We only consider `mul` values as intentional fallbacks. So we only use `mul` values as placeholders and not `en` values.
**Solution:**
If a `mul` label is available, use it as a placeholder for all other existing languages with an empty value.
**Mockups:**
{F37000994}
| [[ https://www.figma.com/file/UMHGYSxln03lGx2z7GxzP2/Multiple-languages?type=design&node-id=340-8642&t=Y283yptnQbwYT2Fi-0 | Link to Figma specs ]] |
**BDD:**
The `mul` Label/Alias is used as a placeholder for all empty Labels/Aliases when the Item is opened for viewing (or editing) on desktop (and mobile).
GIVEN an Item with a `mul` Label/Alias specified
WHEN the Item is opened for viewing (or editing) on desktop (or mobile)
THEN all empty Labels/Aliases are shown with the `mul` Label/Alias as a placeholder (in gray, see mockups)
**Acceptance criteria:**
[] The `mul` Label/Alias is used as a placeholder for all empty Labels/Aliases when the Item is opened for viewing (or editing) on desktop (see mockups and BDD).
[] Release to test.wikidata.org