FormatDistance doesn't work the same way for all locales

[rezof]

The issue:

formatDistance returns words instead of numbers in certain locales & formatDuration has the issue as well since it uses the locale function formatDuration.

for Example:

sv

const duration =  {years: 1, days: 25, months: 3};
formatDuration(duration, { format, zero, delimiter, locale }); // =>  "ett år, tre månader, 25 dagar"

en :

const duration =  {years: 1, days: 25, months: 3};
formatDuration(duration, { format, zero, delimiter, locale }); // =>  "1 year, 3 months, 25 days"

i believe the correct behavior is the second since the majority of the locales return numbers & not words.
The sv locale has a wordMapping array (word for numbers < 13) which does not exist in other locales, maybe a leftover from old API

[rezof]

Am up to create a PR to fix this issue.

[cupofjoakim]

+1 on this issue. We support a multitude of languages and really enjoy having date-fns here, but right now we have to monkey patch sv and nn due to this behaviour.