This fixes two regressions, caused by #1167 and #1191 .

Turn off by default.

No matter what LANGUAGE_CHOICE was set to it would always take the en branch.
I revamped it a bit to use a macro to create the language include file name. This required a slight tweak to the RU declaration since it's special-cased in a couple places in code.

This is an attempt to pull my changes from #1222 over.

To test/enable, uncomment the #define DELTA_CALIBRATION_MENU in Configuration.h

fixed minor typo

void manage_inactivity(bool ignore_stepper_queue=false)

standard is false so it is not necessary to change additional code. this
change should be better, hopefully nophead like this :)

more speaking name

make a more general solution

Tested for SAV MKI and SAV 3D LCD on lewihe.

- Fixed issue when BAL area probing is shorter than it should be for
grid probing
- Warning when BAL activated with Delta Kinematics
- Fix XY_TRAVEL_SPEED when homing Z axis

Current defaults are all 255.  If it makes sense to reduce them, they should come down together, and
be in a  PID_INTEGRAL_DRIVE_MAX <= PID_MAX <- BANG_MAX relationship.

Moved PSTR() macro to correct place which was causing the " initializer fails to determine size of '__c' " when attempting to compile with BABYSTEPPING enabled.

Changed level to compensation

Changed leveling to compensation

Changed level and leveling to compensation.

Changed level and leveling to compensation

Changed level and leveling to compensation (except with "verbose_level" and "lcd_reset_alert_level").

Changed AUTO_BED_LEVELING to AUTO_BED_COMPENSATION

Changed AUTO_BED_LEVELING to AUTO_BED_COMPENSATION

Changed AUTO_BED_LEVEL to AUTO_BED_COMPENSATION

Changed AUTO_BED_LEVEL to AUTO_BED_COMPENSATION

Changed Auto Bed Level to Auto Bed Compensation

in

G0 to G3 were previously acknowledged in the get_command method, causing
them to be possibly acknowledged before commands coming after them that
were acknowledged in process_commands.

This patch fixes this, moving the acknowledgement of G0 to G3 to the
process_commands method as well. These commands are therefore no
longer acknowledged when the enter the cmd_buffer but instead only
acknowledged when the enter the plan_buffer.

Guaranteeing that commands are acknowledged in the same order in which
they were received by the firmware allows host software to be able to
track the life cycle of commands and such a better management of the
firmware's serial buffers as well as better internal command processing
and response parsing without having to depend on throwing an epic
amount of regular expressions against each line received back from the
firmware.

Fixes ErikZalm/Marlin#1147

Added boards.h which contains defines for all the board numbers, plus
some shorthand macros for less typing.

Added boards.h which contains defines for all the board numbers, plus
some shorthand macros for less typing.

Breaking up languages.h makes it easier to translate. Using language
codes makes it easier to select a language and sets the naming standard.