Custom and translated crop names

Allow genebanks to provide their own translations of cropName in the genesysConfig.i18n section:

en: {
  translations: {
    crop: {
     "Cassava": "Cassava"
    }
  }
},
es: {
  translations: {
    crop: {
     "Cassava": "Manioc"
    }
  }
}

If no mapping is available, then the cropName value is displayed as is.