Brand the webmail INBUXA: name, mark and wordmark

INBUXA is a product suite and ihasmail an independent product, so INBUXA's
webmail says INBUXA: the sign-in page, header, page title, installed-app name
and About page. The wordmark is drawn in the current text color. ihasmail's
version and AGPL source line stay as its credit. Two new strings, in all nine
catalogues; three Stalwart-only ones are no longer used.

web/src/locales/es.ts

@@ -1215,6 +1215,8 @@ export const catalog: Catalog = {
     "Could not save filters: {error}": "No se pudieron guardar los filtros: {error}",
     "Could not send the receipt: {error}": "No se pudo enviar la confirmación de lectura: {error}",
     "Could not sign in.": "No se pudo iniciar sesión.",
+    "About INBUXA webmail": "Acerca de INBUXA webmail",
+    "Mail server": "Servidor de correo",
     "You'll enter your password on your mail server's sign-in page.": "Introducirá su contraseña en la página de inicio de sesión de su servidor de correo.",
     "You'll sign in on your mail server's own page.": "Iniciará sesión en la propia página de su servidor de correo.",
     "This sign-in didn't start in this browser. Try again.": "Este inicio de sesión no empezó en este navegador. Inténtelo de nuevo.",