forgotten password page not translatable

[NLW-paulm]

Within the Omeka translations file we have the strings for the forgotten password page translated. However they only appear in English.
It appears that the lang param is not being passed to that page, as even going to that page from a /cy/ site, after inputting the forgotten password details its returns you to the English site too.

We want to translate this page
https://torf.llyfrgell.cymru/forgot-password

The link to it is on this page (welsh language)
https://torf.llyfrgell.cymru/cy/s/hwiangerddi/login

Once you input an email it then returns you to the english side, the cy is missing from the url even though you went to it from a Welsh page (Which is why i think its dropping the lang identifier.)

https://torf.llyfrgell.cymru/s/llgc/login