Backbutton on partnersites

[lauraroverts]

At a partnersite like http://ghanaf4w.akvoapp.org/en/, you can't change the name of the Backbutton. The Backbutton reads: 'Back to Ghana', but it redirects to the homepage. At the moment the name in the Backbutton is the same as the organisation's name in the RSR admin, see screenshot:

If it redirects to the homepage, you should also be able to name the Backbutton: 'Back to home'

[adriancollier]

We need to add a field in Partnersites to be able to rename the Back Button.

This change should not take longer than 1 working day.

[adriancollier]

As @kardan mentioned, we need to complete a couple more actions on this:

• Ensure the field is visible in the admin
• Make the default entry for this field to display the current text: "Back to %Org Name%"
• Ensure when the field is empty, the system uses this default value

[KasperBrandt]

Merged, see #519

[KasperBrandt]

Test plan

1. Migration
   GIVEN migration 0050
   WHEN it is successful
   THEN the partnersite model should have a new field: custom_return_url_text
   AND this field should be empty by default
2. Partnersite admin
   GIVEN a partnersite admin
   WHEN the admin is opened
   THEN the custom_return_url_text field should be visible
   AND by default empty
   AND the user should be able to edit and save a new value for this field
3. Empty field
   GIVEN an empty custom_return_url_text field
   WHEN a page on the partnersite is opened
   THEN the organisation name of the Page should be mentioned in the back button
4. Filled in field
   GIVEN a filled in custom_return_url_text field
   WHEN a page on the partnersite is opened
   THEN this value should be mentioned in the back button

[rumca]

One pretty minor issue, in the admin is it expected that Leave empty to display "Back to %organisation name%". is the label on this new field? Or should the %..% actually be populated with an org name?

The other field labels all use _myorganisation_ which is slightly clearer.