Plurals - only two?

Hi. Help please with plurals. I'm limited to two. However we have names for plurals eg:

• 1 day = diwrnod
• 2 days = deuddydd
• 3 days = tridiau
• 4 days = 4 diwrnod / 5 dirnod / etc

How do I code this pls?

Similar problem where masculine nouns undergo an Aspirate Mutation after 'tri' (three) eg:

• 1 car = 1 car
• 2 cars = 2 gar
• 3 cars = 3 char
• 4 cars = 4 car / 5 car...

Usually you add the prefix -au (e.g schools = ysgolau) but in some loan words you just add an s (e.g wikis = wicis). Sometimes a w is added at the end of a word but not much as far as I can recall (sorry I’m using a swear word as an example of this; tits = titw).

For which language do you ask?

I only translate into Welsh / cy.

I am not familiar with Welsh and don't know off hand, if there are strict limitations for Welsh in the system.

Have you tried {{PLURAL:$1|1=diwrnod|2=deuddydd|3=tridiau|dirnod}}. See Plural for more information.