Catalan do not capitalize the days of the week, months, or national adjectives

**Describe the bug**
As per [https://en.wikipedia.org/wiki/Catalan_orthography#Capitalization](https://en.wikipedia.org/wiki/Catalan_orthography#Capitalization) Catalan do not capitalize the days of the week, months, or national adjectives.

So change the language to Catalan and check the month, weekdays they are coming with capital letters.
e.g.
August -> Agost

**Expected behavior**
Month, weekdays should not come with capitalize letters.
e.g.
August -> agost

**Information**
- Day.js Version - v1.11.10
- OS: Every
- Browser: Every
- Time zone: Any

**Please Note**: I'm not language expert nor I know Catalan. This issue brought to my attention so I'm raising this here. Please confirm this with respective language expert.