[FIX] manifest: use comma separated in author.

Apps store uses comma separated convention to sort by author the apps.
Closes #13574

addons/l10n_be/__manifest__.py

@@ -34,7 +34,7 @@ Wizards provided by this module:
         **Path to access :** Invoicing/Reporting/Legal Reports/Belgium Statements/Annual Listing Of VAT-Subjected Customers
 
     """,
-    'author': 'Noviat & Odoo SA',
+    'author': 'Noviat, Odoo SA',
     'depends': [
         'account',
         'base_vat',

addons/l10n_uy/__manifest__.py

@@ -4,7 +4,7 @@
 {
     'name': 'Uruguay - Chart of Accounts',
     'version': '0.1',
-    'author': 'Uruguay l10n Team & Guillem Barba',
+    'author': 'Uruguay l10n Team, Guillem Barba',
     'category': 'Localization',
     'website': 'https://launchpad.net/openerp-uruguay',
     'description': """