Traduciendo un banco de trabajo externo

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En las siguientes notas, "contexto" debe ser el mismo nombre de tu complemento o banco de trabajo, por ejemplo, "MiSuperComplemento" o "DraftPlus", o el que sea. Este contexto hace que todas esas traducciones de tu código sean reunidas bajo el mismo nombre, para que sean mas fácilmente identificables por los traductores. Esto es, ellos sabrán exactamente a cual complemento o banco de trabajo una cadena de texto pertenece.

Preparando las fuentes


  • Agregar una carpeta translations/. Puedes nombrarlo con algo más, pero esto sera mas sencillo como es el mismo en todo FreeCAD. En esta carpeta, tu colocaras los archivos .ts (Los archivos de traducción "fuente" ) y los archivos .qm (Archivos compilados de traducción).
  • Solo el texto que es mostrado al usuario en la Interface de usuario FreeCAD debera ser traducida. Solo el texto que es mostrado en la consola de python no debe ser traducida.
  • Texto que es impreso con FreeCAD.Console es mostrado en "Vista de reporte", y por lo tanto de ser traducido. La "Vista de reporte es diferente a la consola de Python".

In every Python .py file:

  • In every file where you need to translate text, you need a translate() function defined. An easy way is to use the one from the Draft Workbench:
from DraftTools import translate
  • All text that must be translated must be passed through the translate() function.
print("My text")


print(translate("context", "My text"))

This can be used anywhere: in print(), in FreeCAD.Console.PrintMessage(), in Qt dialogs, etc. The FreeCAD.Console functions do not automatically add the newline character (\n), so this must be added at the end if desired. This character doesn't need translation either, so it can be outside the translating function:

FreeCAD.Console.PrintMessage(translate("context", "My text") + "\n")
  • If you are using .ui files made with QtDesigner, nothing special needs to be done with them.
  • When creating new objects, do not translate the object's "Name". Rather, translate object's "Label". The difference is that a "Name" is unique; it stays the same throughout the life of the object; on the other hand, a "Label" can be changed by the user as desired.
  • When creating properties for your objects, don’t translate the property name. But place the description inside QT_TRANSLATE_NOOP:
obj.addProperty("App::PropertyBool", "MyProperty", "PropertyGroup", QT_TRANSLATE_NOOP("App::Property", "This is what My Property does"))

Don't use your own "context" in this specific case. Keep "App::Property".

  • Do not translate the text of document transactions made with Document.openTransaction()


  • Add the following line, close to the top of the file:
def QT_TRANSLATE_NOOP(scope, text):
    return text
  • To translate menu names:
self.appendMenu(QT_TRANSLATE_NOOP("context", "My menu"), [list of commands, ...])
  • The QT_TRANSLATE_NOOP macro doesn’t do anything, but it marks texts to be picked up by the lupdate utility later on. Since it doesn't actually do anything, we only use it in special cases where FreeCAD itself takes care of everything.
  • Add the path to your translations/ folder in the Initialized function:

The file has no file attribute, so it is not easy to find the translations folder’s relative location. An easy way to work around this is to make it import another file from the same folder, and in that file, do

FreeCADGui.addLanguagePath(os.path.join(os.path.dirname(__file__), "translations"))

Inside each FreeCAD command class:

  • Add the following line, close to the top of the file:
def QT_TRANSLATE_NOOP(context, text):
    return text
  • Translate the 'MenuText' and 'Tooltip' of the command like this:
def GetResources(self):
    return {'Pixmap'  : "path/to/icon.svg"),
            'MenuText': QT_TRANSLATE_NOOP("CommandName", "My Command"),
            'ToolTip' : QT_TRANSLATE_NOOP("CommandName", "Describes what the command does"),
            'Accel'   : "Shift+A"

where "CommandName" is the name of the command, defined by

FreeCADGui.addCommand('CommandName', My_Command_Class())

Gather all the strings from your module

  • You will need the lupdate, lconvert, lrelease and pylupdate tools installed on your system. In Linux distributions they usually come in packages named pyside-tools or pyside2-tools. On some systems lupdate is named lupdate4 or lupdate5 or lupdate-qt4 or similar. Same for the other tools. You may use the Qt4 or Qt5 version at your choice.
  • If you have .ui files, you need to run lupdate first:
lupdate *.ui -ts translations/uifiles.ts

This is recursive and will find .ui files inside all your directory structure

  • If you have .py files, you need to run pylupdate too:
pylupdate *.py -ts translations/pyfiles.ts
  • If you ran both operations, you now need to unify these two files into one:
lconvert -i translations/uifiles.ts translations/pyfiles.ts -o translations/MyModule.ts
  • Check the contents of the three .ts files to make sure that they contain the strings, then you can delete both pyfiles.ts and uifiles.ts.
  • You can do it all in one bash script like this:
lupdate *.ui -ts translations/uifiles.ts
pylupdate *.py -ts translations/pyfiles.ts
lconvert -i translations/uifiles.ts translations/pyfiles.ts -o translations/MyModule.ts
rm translations/pyfiles.ts
rm translations/uifiles.ts

Send the .ts file to a translation platform

It is time to have your .ts file translated. You can choose to set up an account on a public translation platform such as Crowdin or Transifex, or you can benefit from our existing FreeCAD account at Crowdin, which has many users already, and therefore more chance to have your file translated quickly and by people who know FreeCAD.

If you wish to host your file on the FreeCAD Crowdin account, get in touch with Yorik on the FreeCAD forum.

Note: some platforms like Crowdin can integrate with GitHub and do all the process from points 2, 3 and 4 automatically. For that, you can’t use the FreeCAD Crowdin account; you will need to set up your own account.

Merge the translations

Once your .ts file has been translated, even if partially, you can download the translations from the site:

  • You will usually download a .zip file containing one .ts per language
  • Place all the translated .ts files, together with your base .ts file, in the translations/ folder

Compile the translations

Now run the lrelease program on each file that you have.

lrelease "translations/Draft_de.ts"
lrelease "translations/Draft_fr.ts"
lrelease "translations/Draft_pt-BR.ts"

You can automate the process

for f in translations/*_*.ts
    lrelease "translations/$f"

You should find one .qm file for each translated .ts file. The .qm files is what will be used by Qt and FreeCAD at runtime.

That's all you need. Note that certain parts of your workbench cannot be translated on-the-fly if you decide to switch languages. If this is the case, you will need to restart FreeCAD for the new language to take effect.

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