lrelease - generate Qt message files from Qt Linguist translation files

       This  page  documents  the QtLinguistRelease tool for the Qt GUI toolkit.  Lrelease reads a qmake/tmake
       project file (.pro file) and converts the translation files (TS files) specified in it  into  Qt  message
       files (QM files) used by the application to translate.

       The  QM  file format is a compact binary format that provides extremely fast lookups for translations and
       that is used by Qt.

       lrelease - generate Qt message files from Qt Linguist translation files

-help  Display the usage and exit.

       -compress
              Compress the QM files.

       -nounfinished
              Do not include unfinished translations.

       -removeidentical
              If the translated text is the same as the source text, do not include the message.

       -silent
              Do not explain what is being done.

       -version
              Display the version of lrelease and exit.

lupdate(1) and http://doc.qt.io/qt-5/qtwidgets-tools-i18n-example.html

Digia Plc and/or its subsidiary(-ies)            18 October 2001                                     lrelease(1)

lrelease [ options ] project-filelrelease [ options ] ts-files [ -qm qm-file ]

       Here is an example .pro file that can be given to lrelease:

           HEADERS         = funnydialog.h \
                             wackywidget.h
           SOURCES         = funnydialog.cpp \
                             main.cpp \
                             wackywidget.cpp
           FORMS           = fancybox.ui
           TRANSLATIONS    = gnomovision_dk.ts \
                             gnomovision_fi.ts \
                             gnomovision_no.ts \
                             gnomovision_se.ts

       When running lrelease on this project file, the Qt message  files  gnomovision_dk.qm,  gnomovision_fi.qm,
       gnomovision_no.qm  and  gnomovision_se.qm  will  be  generated from gnomovision_dk.ts, gnomovision_fi.ts,
       gnomovision_no.ts and gnomovision_se.ts, respectively.

       Lrelease can also be invoked with a list of TS files to convert:

           lrelease gnomovision_*.ts