[BUG] Use singular `map` for 1 map (instead of `1 maps`) in Featured Mappers

[KarishmaVanwari]

What happened just before the problem occurred

On the home page, under the Featured Mappers, plural maps is used for 1 map.

Relevant URLs

https://mapknitter.org/

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[KarishmaVanwari]

@jywarren @TildaDares @cesswairimu Can I work on this?

[jywarren]

Hi @KarishmaVanwari yes if you'd like! I believe there are pluralization helpers available in Rails, it's probably worth looking them up! Thank you!

[KarishmaVanwari]

Sure, @jywarren. Thanks!