following commit: https://www.lyx.org/trac/changeset/38169.
If you need to manually regenerate the layouttranslations file from .po files
-run `make ../lib/layouttranslations' in the po directory. The Python polib
-library is needed for building the output file.
+- Under Linux: execute the command
+ `make ../lib/layouttranslations'
+ in the po directory. The Python polib library is needed for building the output
+ file.
+- Under Windows:
+ 1. install the Python extensions "polib". To do this,
+ 1.1 open a commen line prompt in the folder where you find the file "pip.exe"
+ withing the python installation folder.
+ 1.2 execute the command
+ pip install polib
+ 2. close the command prompt and open the file "lyx.sln" with MSVC. You find
+ file in the compilation result folder you set for LyX
+ 3. right click in MSVC on the target "layouttranslations1" and choose "Rebuild"
Optionally - to quickly check whether some new translatable strings appeared
for your language you can always check ../lib/layouttranslations.review.