Fix typos spotted during translations

* agent/genkey.c: s/to to/to/
* sm/*.c: s/failed to allocated/failed to allocate/
* sm/certlist.c, ./dirmngr/validate.c: s/should have not/should not have/
* g10/seskey.c: missing closing parenthesis
* dirmngr/crlcache.c: s/may has/may have/

Consistency fix:

• g10/gpg.c, kbx/kbxutil.c, sm/gpgsm.c: uppercase after Syntax
• dirmngr/dirmngr_ldap: no period in Syntax
• dirmngr/dirmngr-client.c: infinitive for option description:

s/certificates are expected/expect certificates/