Based on user testing, we know that the "multiple languages" name and the copy of explanations are not intuitive.
**Mockup:**
Status quo:
{F37743151}
Proposal:
{F37822945} "default values (mul)"
**New copy:**
```
New! Add default labels and aliases for multiple languages (mul)
The default values are used for all languages with empty labels and aliases in order to minimize repetition. More information
[] Don't show this again
```
**Acceptance criteria:**
[] Change "multiple languages" to "default values (mul)" in [[ https://codesearch.wmcloud.org/things/?q=multiple+languages&i=fosho&files=.%2A%2Fen.json#Extension:Wikibase | most of the places ]]
[x] Desktop Termbox
[x] Special:NewItem (T329626)
[x] Special:NewProperty
[] Accessibility copy for screen readers
[] ~~Mobile Termbox~~
[] The copy of the onboarding popup is changed to the new copy.
[] Change the linked URL to: https://www.wikidata.org/wiki/User:Manuel_Merz_(WMDE)/Help:Default_values_for_labels_and_aliases
**Discussed questions:**
* Q: What would the best caption be?
** A: Let's go with "default values (mul)" for now.
* Q: Should we also rename the language code to "default" or should we keep it "mul"? (visible in the API and special pages)
** A: No, we keep the language code mul (see T345083#9199970 for arguments).