FMSLogo Code

Try to clarify the logic which prints out shadowed English procedures.

Retranslate command-line as "línea de comandos", which matches Wikipedia.
This new translation matches the text in the message box when the command line is corrupt.
The other translation "línea de órdenes" is also in use, but its not the most common term.

Swap the Spanish translations for HT and HIDETURTLE so that HT is the abbrivation.
This has no impact on functionality, but it fixes the way the translation tables are built in the Spanish version's manual.

Translate the headings for the Arithmetic chapter to Spanish.
This was based on the Rosario Ruiz's translation of the MSWLogo manual.

Translate x_margin to margen_x.

Clarify that the description of SETCURSOR applies to other Logos, not FMSLogo.

Fix misspelling of Específicamente

Translate the documentation for the "Communication" commands to Spanish.
The translation was based on Rosario Ruiz's translation of the MSWLogo manual.

Fix typo: suportar -> soportar

Add missing <userinput> tags to the KEYBOARDOFF example