Code review

Hello list,

Is this the proper place to point out any oddities I may find in trying to 
make sense of KMail code? Some questions will no doubt be newbie grade, 
becuase I've never looked at C++ before. I've extracted and configured the 
source under ~/projects/myKmail/kmail-19.04.3.

The first thing I've noticed is that the file kmail-19.04.3/po/en_GB/
akonadi_mailfilteragent.po contains lots of four-line stanzas like this:

#: filterlogdialog.cpp:102
#, kde-format
msgid "Share..."
msgstr "Share..."

But one of them has an extra line:

#. i18n( "" ) );
#: filterlogdialog.cpp:136
#, kde-format
msgid "Log filter &rule evaluation"
msgstr "Log filter &rule evaluation"

First, what does the i18n line do, and second, why does it have an extra 
closing bracket? Could anything go wrong because of this?

-- 
Regards,
Peter.

Gentoo stable system, openrc-0.41.2
gcc 8.3.0, sys-kernel/gentoo-sources 4.19.66
QT 5.12.3, KDE frameworks 5.60.0, KDE plasma 5.15.5
KDE apps 19.04.3 incl KMail 19.04.3 (5.11.3), akonadi 19.04.3
dev-db/mariadb-10.2.22-r1, net-libs/webkit-gtk-2.24.2
x11-drivers/xf86-video-amdgpu 19.0.1
dev-libs/amdgpu-pro-opencl 19.10.785425-r1