feat(libra): mention the "Other" account on the income account step

Append the same "Other" account guidance to the income form's Step 1
(libra.income.selectAccount) that the expense form already shows, for
consistency. Updated across en / fr / es locales.

src/i18n/locales/en.ts

@@ -202,7 +202,7 @@ const messages: LocaleMessages = {
     income: {
       title: 'Add Income',
       description: 'Submit income for the organization',
-      selectAccount: 'Select the revenue account',
+      selectAccount: 'Select the revenue account. Use the "Other" account if you\'re not sure.',
       submitIncome: 'Submit Income',
       notAvailable: 'Income submission is not yet available. This feature is coming soon.',
     },

src/i18n/locales/es.ts

@@ -202,7 +202,7 @@ const messages: LocaleMessages = {
     income: {
       title: 'A\u00f1adir ingreso',
       description: 'Enviar un ingreso para la organizaci\u00f3n',
-      selectAccount: 'Seleccionar la cuenta de ingresos',
+      selectAccount: 'Seleccionar la cuenta de ingresos. Use la cuenta "Other" si no está seguro.',
       submitIncome: 'Enviar ingreso',
       notAvailable: 'El registro de ingresos a\u00fan no est\u00e1 disponible. Esta funci\u00f3n llegar\u00e1 pronto.',
     },

src/i18n/locales/fr.ts

@@ -202,7 +202,7 @@ const messages: LocaleMessages = {
     income: {
       title: 'Ajouter un revenu',
       description: 'Soumettre un revenu pour l\u2019organisation',
-      selectAccount: 'S\u00e9lectionner le compte de revenus',
+      selectAccount: 'S\u00e9lectionner le compte de revenus. Utilisez le compte "Other" si vous n\'\u00eates pas s\u00fbr.',
       submitIncome: 'Soumettre le revenu',
       notAvailable: 'La saisie de revenus n\u2019est pas encore disponible. Cette fonctionnalit\u00e9 arrive bient\u00f4t.',
     },