diff --git a/openerp/addons/base/module/wizard/base_import_language.py b/openerp/addons/base/module/wizard/base_import_language.py
index d73cd0864a6..fdb9a177d8b 100644
--- a/openerp/addons/base/module/wizard/base_import_language.py
+++ b/openerp/addons/base/module/wizard/base_import_language.py
@@ -35,9 +35,12 @@ class base_language_import(osv.osv_memory):
         'name': fields.char('Language Name',size=64 , required=True),
         'code': fields.char('Code (eg:en__US)',size=5 , required=True),
         'data': fields.binary('File', required=True),
+        'overwrite': fields.boolean('Overwrite Existing Terms',
+                                    help="If you enable this option, existing translations (including custom ones) "
+                                         "will be overwritten and replaced by those in this file"),
     }
 
-    def import_lang(self, cr, uid, ids, context):
+    def import_lang(self, cr, uid, ids, context=None):
         """
             Import Language
             @param cr: the current row, from the database cursor.
@@ -45,8 +48,11 @@ class base_language_import(osv.osv_memory):
             @param ids: the ID or list of IDs
             @param context: A standard dictionary
         """
-
+        if context is None:
+            context = {}
         import_data = self.browse(cr, uid, ids)[0]
+        if import_data.overwrite:
+            context.update(overwrite=True)
         fileobj = TemporaryFile('w+')
         fileobj.write(base64.decodestring(import_data.data))
 
@@ -56,7 +62,7 @@ class base_language_import(osv.osv_memory):
         fileformat = first_line.endswith("type,name,res_id,src,value") and 'csv' or 'po'
         fileobj.seek(0)
 
-        tools.trans_load_data(cr, fileobj, fileformat, import_data.code, lang_name=import_data.name)
+        tools.trans_load_data(cr, fileobj, fileformat, import_data.code, lang_name=import_data.name, context=context)
         tools.trans_update_res_ids(cr)
         fileobj.close()
         return {}
diff --git a/openerp/addons/base/module/wizard/base_import_language_view.xml b/openerp/addons/base/module/wizard/base_import_language_view.xml
index d313afc4080..4a1d7e5b758 100644
--- a/openerp/addons/base/module/wizard/base_import_language_view.xml
+++ b/openerp/addons/base/module/wizard/base_import_language_view.xml
@@ -27,6 +27,7 @@
                             <field name="name" width="200"/>
                             <field name="code"/>
                             <field name="data" colspan="4"/>
+                            <field name="overwrite"/>
                         </group>
                         <group colspan="8" col="8">
                             <separator string="" colspan="8"/>