I18N: Annotate indentation of the transaction summary

[ppisar]

Translators are recommend to align the messages to prevent from a broken table:

Podsumowanie transakcji:
 Instalowanie:         6 pakietów
 Aktualizowanie:         33 pakietów
 Zastępowanie:         48 pakietów
 Usuwanie:         199 pakietów

Relates: https://bugzilla.redhat.com/show_bug.cgi?id=2336561

[kontura]

I saw there are macros to provide context for translatable messages: https://github.com/rpm-software-management/dnf5/blob/main/include/libdnf5/utils/bgettext/README.md?plain=1#L56

It is used only on couple places, like:

dnf5/libdnf5/base/transaction.cpp

Line 1373 in 3fa8d63

repos_with_skipped_checks, C_("It is a joining character for repositories IDs", ", "));

However I don't know how it will show up to the translators or even if it is better then than normal comments.

[ppisar]

Gettext context is used to differentiate two messages which are worded the identically in English, but needs different translation in other languages. Using them for belonging-to-summary-transaction-table would be an abuse and more importantly would not deliver the annotation to the translators.

[kontura]

I see, thanks.