Admin messages need capfirst for translations

[Erik Wognsen]

As discussed in the i18n group ​here, admin messages such as "The %(name)s "%(obj)s" was changed successfully." have translations starting immediately with "%(name)s" in many languages. Since the verbose name of the model is lowercase, the result is a message saying e.g. 'employee "Xyz" was changed successfully' where it should start with 'Employee'.

[Erik Wognsen]

The attached patch also fixes the problem that these three translated strings exist:

'The %(name)s "%(obj)s" was added successfully.',
'You may edit it again below.', and the combined
'The %(name)s "%(obj)s" was added successfully. You may edit it again below.'

In response_change where the combined version is used, I have split it into the two already translated strings so the redundant string is removed and it matches the way 'You may edit it again below.' is added to the 'was added successfully' message in response_add.

[Julien Phalip]

Thanks for this. It has already been reported in #16350, so I'm closing as a duplicate. Please continue the conversation over there. Cheers!

[Aymeric Augustin]

#17246 was a duplicate.