The resource file you are looking for are inside the ApplicationTemplateCore.wsp file, in the Config\Resources\ and Resources\ folders.

Here's a detailed example for the Absence and Vacation Schedule template:

1. Extract the files from both WSP files (technically they are CAB files)
2. Translate the resources

• AbsenceVacationSchedule:
  1. Create a 1045 folder.
  2. Copy the contents of the 1033 folder into it.
  3. Translate all the strings in the WEBTEMPAbsence.xml file.
  4. Add the 1045 folder to the list in the Manifest.xml file.
• ApplicationTemplateCore:
  1. Create the following files:
     • Config\Resources\tsa.pl-pl.resx,
     • Resources\avm.pl-pl.resx,
     • Resources\tsa.pl-pl.resx.
  2. Copy the contents of the appropriate English resource files into the newly created files.
  3. Translate all the strings.
  4. Add new files to the list in the Manifest.xml file.

3. Compress all the files back into WSP templates
4. Download CAB SDK from here.
5. Extract the CABARC.EXE file and the CABARC.DOC document.
6. Use something like ..\CABARC.EXE -p -r n ..\SiteTemplate.cab .\* (this should be executed after changing working directory to the one containing template files) to create a CAB file and change its extension to WSP.

The resource file you are looking for are inside the ApplicationTemplateCore.wsp file, in the Config\Resources\ and Resources\ folders.

Here's a detailed example for the Absence and Vacation Schedule template:

1. Extract the files from both WSP files (technically they are CAB files)
2. Translate the resources

• AbsenceVacationSchedule:
  1. Create a 1045 folder.
  2. Copy the contents of the 1033 folder into it.
  3. Translate all the strings in the WEBTEMPAbsence.xml file.
  4. Add the 1045 folder to the list in the Manifest.xml file.
• ApplicationTemplateCore:
  1. Create the following files:
     • Config\Resources\tsa.pl-pl.resx,
     • Resources\avm.pl-pl.resx,
     • Resources\tsa.pl-pl.resx.
  2. Copy the contents of the appropriate English resource files into the newly created files.
  3. Translate all the strings.
  4. Add new files to the list in the Manifest.xml file.

3. Compress all the files back into WSP templates
4. Download CAB SDK from one of the mirrors - 1 or 2 (the original link seems to be dead).
5. Extract the CABARC.EXE file and the CABARC.DOC document.
6. Use something like ..\CABARC.EXE -p -r n ..\SiteTemplate.cab .\* (this should be executed after changing working directory to the one containing template files) to create a CAB file and change its extension to WSP.