Fix set of NLS translation issues

Michael Paquier <michael@paquier.xyz>

Commit: 72be8c29a18812975fcc8765a122faf0e4d0c755
Author: Michael Paquier <michael@paquier.xyz>
Date: 2018-08-21T06:17:13Z
Releases: 12.0
Fix set of NLS translation issues

While monitoring the code, a couple of issues related to string
translation has showed up:
- Some routines for auto-updatable views return an error string, which
sometimes missed the shot.  A comment regarding string translation is
added for each routine to help with future features.
- GSSAPI authentication missed two translations.
- vacuumdb handles non-translated strings.
- GetConfigOptionByNum should translate strings.  This part is not
back-patched as after a minor upgrade this could be surprising for
users.

Reported-by: Kyotaro Horiguchi
Author: Kyotaro Horiguchi
Reviewed-by: Michael Paquier, Tom Lane
Discussion: https://postgr.es/m/20180810.152131.31921918.horiguchi.kyotaro@lab.ntt.co.jp
Backpatch-through: 9.3

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