pginstaller - pginst: Fix a couple of version numbers per Harald Armin

Log Message:
-----------
Fix a couple of version numbers per Harald Armin Massa

Tags:
----
REL8_1_STABLE

Modified Files:
--------------
pginst/lang:
de_welcome.rtf (r1.5 -> r1.5.2.1)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pginstaller/pginst/lang/de_welcome.rtf.diff?r1=1.5&r2=1.5.2.1)
pt_br_welcome.rtf (r1.5 -> r1.5.2.1)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pginstaller/pginst/lang/pt_br_welcome.rtf.diff?r1=1.5&r2=1.5.2.1)