fix: Update nb locale (#679)

Author: fjeddy

src/locale/nb.js

@@ -19,7 +19,7 @@ const locale = {
   },
   relativeTime: {
     future: 'om %s',
-    past: 'for %s siden',
+    past: '%s siden',
     s: 'noen sekunder',
     m: 'ett minutt',
     mm: '%d minutter',