react-i18next 14 reserves `count` as the pluralization variable and no
longer interpolates it from a <Trans> object child, so <strong>{{count:N}}</strong>
left {{count,number}} unresolved -> the number formatter ran on undefined ->
"NaN". (t() and the countTotal var were unaffected; regression from the
i18next 10->23 / react-i18next 7->14 bump.)
Renamed the variable count -> inMap in FiresMap.js and in the
activeFireInMapCount value of the es/en/gl locales (the string has no plural
forms, so count was only an unlucky name). Browser-verified: /fires now shows
the real count; home/zones/fire-detail render with no real errors. REST smoke
byte-identical.
