Certificate lifetime displayed as NaN

[Adadov]

Issue Description
HOST_TIME_GMT content depends on user locale. When using cockpit in French (maybe others too) date calculation doesn't work, Date.parse() is unable to parse French format returned by shell running "date" command.

Package Version and Platform:

• Browser: Firefox <= 119
• Package: cockpit-389-ds

Steps to Reproduce
Steps to reproduce the behaviour:

1. Set cockpit "Display language" to "French"
2. Open any LDAP entry containing a certificate using "LDAP Browser"
3. The certificate will be displayed as expired since NaN day
   

[vashirov]

d5345e7..d3bb02a 389-ds-base-1.4.3 -> 389-ds-base-1.4.3
f1cfa74..b2092b8 389-ds-base-2.0 -> 389-ds-base-2.0
47eccfb..3b4044b 389-ds-base-2.1 -> 389-ds-base-2.1
2f5029e..bf43865 389-ds-base-2.2 -> 389-ds-base-2.2
d1135cc..4e17fd6 389-ds-base-2.3 -> 389-ds-base-2.3
dec3183..650dc51 389-ds-base-2.4 -> 389-ds-base-2.4
93ebf3c..70d35ba 389-ds-base-2.5 -> 389-ds-base-2.5