fix setup.py and a few imports

gui/gui_classic/history_widget.py

@@ -1,5 +1,5 @@
 from PyQt4.QtGui import *
-from i18n import _
+from electrum.i18n import _
 
 class HistoryWidget(QTreeWidget):
 

gui/gui_classic/lite_window.py

@@ -15,7 +15,7 @@ except ImportError:
 from decimal import Decimal as D
 from electrum.util import get_resource_path as rsrc
 from electrum.bitcoin import is_valid
-from i18n import _
+from electrum.i18n import _
 import decimal
 import exchange_rate
 import json

gui/gui_classic/receiving_widget.py

@@ -1,6 +1,6 @@
 from PyQt4.QtGui import *
 from PyQt4.QtCore import *
-from i18n import _
+from electrum.i18n import _
 
 class ReceivingWidget(QTreeWidget):