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Localization_guide.md

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Localization and translation guide

The purpose of this guide is to describe how to contribute to the PrusaSlicer translations. We use GNUgettext for extracting string resources from the project and PoEdit for editing translations.

Those can be downloaded here:

After GNUgettext is installed, it is recommended to add the path to gettext/bin to PATH variable.

Full manual for GNUgettext can be seen here: http://www.gnu.org/software/gettext/manual/gettext.html

Scenario 1. How do I add a translation or fix an existing translation

  1. Get PO-file from corresponding folder here: https://github.com/prusa3d/PrusaSlicer/tree/master/resources/localization
  2. Open this file in PoEdit as "Edit a translation"
  3. Apply your corrections to the translation
  4. Push changed PrusaSlicer.po and PrusaSlicer.mo (will create automatically after saving of PrusaSlicer.po in PoEdit) back to to the enter folder.

Scenario 2. How do I add a new language support

  1. Get file PrusaSlicer.pot here : https://github.com/prusa3d/PrusaSlicer/tree/master/resources/localization
  2. Open it in PoEdit for "Create new translation"
  3. Select Translation Language (for example French).
  4. As a result you will have fr.po - the file containing translation to French. Notice. When the translation is complete you need to:

Scenario 3. How do I add a new text resource when implementing a feature to PrusaSlicer

Each string resource in PrusaSlicer available for translation needs to be explicitly marked using L() macro like this:

auto msg = L("This message to be localized")

To get translated text use one of needed macro/function (_(s) or _CHB(s) ). If you add new file resource, add it to the list of files containing macro L()

Scenario 4. How do I use GNUgettext to localize my own application taking PrusaSlicer as an example

  1. For convenience create a list of files with this macro L(s). We have https://github.com/prusa3d/PrusaSlicer/tree/master/resources/localization/list.txt.

  2. Create template file(*.POT) with GNUgettext command:

        xgettext --keyword=L --add-comments=TRN --from-code=UTF-8 --debug -o PrusaSlicer.pot -f list.txt
    

    Use flag --from-code=UTF-8 to specify that the source strings are in UTF-8 encoding Use flag --debug to correctly extract formatted strings(used %d, %s etc.)

  3. Create PO- and MO-files for your project as described above.

  4. To merge old PO-file with strings from created new POT-file use command:

        msgmerge -N -o new.po old.po new.pot
    

    Use option -N to not using fuzzy matching when an exact match is not found.

  5. To concatenate old PO-file with strings from new PO-file use command:

        msgcat -o new.po old.po
    
  6. Create an English translation catalog with command:

        msgen -o new.po old.po
    

    Notice, in this Catalog it will be totally same strings for initial text and translated.

When you have Catalog to translation open POT or PO file in PoEdit and start to translation, it's very important to keep attention to every gaps and punctuation. Especially with formatted strings. (using %d, %s, etc.)