adopted OCA file layout

base_usability/models/misc.py

@@ -0,0 +1,17 @@
+# © 2015-2016 Akretion (Alexis de Lattre <alexis.delattre@akretion.com>)
+# License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl).
+
+from odoo import models, fields
+
+
+class BaseLanguageExport(models.TransientModel):
+    _inherit = 'base.language.export'
+
+    # Default format for language files = format used by OpenERP modules
+    format = fields.Selection(default='po')
+
+
+class BaseLanguageInstall(models.TransientModel):
+    _inherit = 'base.language.install'
+
+    overwrite = fields.Boolean(default=True)