Translate "Lieferung / Abnahme" to "Delivery"

In Customer Billables. We suggest to translate "Lieferung / Abnahme" to "Delivery".

Steps to reproduce

1. Navigate to "Invoice > Billables > Customers"
2. One of the filter title reads "Lieferung / Abnahme". Expected result is an English wording. How about "Delivery"?
   Any better translation is really welcome. We're not clear about the meaning of "Abnahme" in that context.
   
   That first View is located at /admin/structure/views/view/billables/edit/panel_pane_4
   There is also a second View located at /admin/structure/views/view/billables/edit/panel_pane_3

Contributing patch

We're contributing a patch. I will attach it here shortly.

Using

• ERPAL: 7.x-2.1+38-dev
• Drupal: 7.39
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• Apache: 2.2.22
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• GD library: 2.0.36
• jQuery Update: jQuery 1.8.2 and jQuery UI 1.10.2
• PHP memory limit: 256M
• Multilingual: i18n modules 7.x-1.13. With path www.domain.ext/en/ and www.domain.ext/fr/
• Firefox / Iceweasel: 38.2.1 (64-bit)
• Chromium: Version 37.0.2062.120 Built on Debian 7.6, running on Debian 7.9 (281580) (64-bit)
• Chrome: 45.0.2454.93 (64-bit)