Can't translate text in the Practice section.

Said. I am translating the UI into Spanish and the text in the Practice section is not available.

Also, the subtitle of the "Capture" button on the chess fundamentals section does not get translated. Looks like its value is hardcoded.

One fixed github.com/ornicar/lila/commit/f3fb5b3d39295deff8cb25b9d54d52c5f315d27f

Practice is not translatable at the moment.