Description of problem:
From Satellite 5.8 is used manifest for activation Satellite. But when I try to activate expired manifest I received message with term 'certificate':

For example:

>> rhn-satellite-activate
ERROR: Satellite Certificate appears to have expired: 2017-01-16

On web UI:
Your satellite certificate has expired. Please visit the following link for steps on how to request or generate a new certificate: https://access.redhat.com/knowledge/tools/satcert Your satellite enters restricted period in 5 day(s).


I think that it is confusing for user what is manifest and what is certificate. I prefer to use only one term "manifest".

Version-Release number of selected component (if applicable):
spacewalk-java-2.5.14-48.el6sat.noarch

How reproducible:
always

Steps to Reproduce:
1. used expired manifest for activation

Actual results:
The term "certificate" is used

Expected results:
Use the word manifest

Additional info:
>> git grep -i "Satellite Certificate"
...
java/code/src/com/redhat/rhn/frontend/strings/jsp/StringResource_en_US.xml:        <source>Checks whether satellite certificate has not expired</source>
...
java/code/src/com/redhat/rhn/frontend/strings/template/StringResource_en_US.xml:          {1} - Days Until satellite certificate expiration: 7
...
java/code/src/com/redhat/rhn/frontend/strings/java/StringResource_en_US.xml:        <source>Your satellite certificate has expired. Please visit the following link for steps on how to request or generate a new c
ertificate: &lt;a href="https://access.redhat.com/knowledge/tools/satcert"&gt;https://access.redhat.com/knowledge/tools/satcert&lt;/a&gt;</source>
...