Call buzz() directly from M428

Follow-up the PR #3082
Follow-up the commit 143ad74: unnoticed updates
Fix for commit b0f5ba0: Z offset: -front [of the nozzle] +behind -> Y offset: -front [of the nozzle] +behind
Standardize the writing method: Z-probe, z-probe -> Z Probe
Adjust spacing

documentation/LCDLanguageFont.md moved to http://www.marlinfirmware.org/ at commit 12d0983757,
but http://www.marlinfirmware.org/ isn't working.

Enabling servo usage on boards with PWM current control
timer5 is used by some boards like the Mini Rambo for controlling motor current via PWM, see stepper.cpp.
```cpp
  #ifdef MOTOR_CURRENT_PWM_XY_PIN
    pinMode(MOTOR_CURRENT_PWM_XY_PIN, OUTPUT);
    pinMode(MOTOR_CURRENT_PWM_Z_PIN, OUTPUT);
    pinMode(MOTOR_CURRENT_PWM_E_PIN, OUTPUT);
    digipot_current(0, motor_current_setting[0]);
    digipot_current(1, motor_current_setting[1]);
    digipot_current(2, motor_current_setting[2]);
    //Set timer5 to 31khz so the PWM of the motor power is as constant as possible. (removes a buzzing noise)
    TCCR5B = (TCCR5B & ~(_BV(CS50) | _BV(CS51) | _BV(CS52))) | _BV(CS50);
  #endif
}
```
Using the same timer for controlling servos results in loss of motor control. So use timer4/3 for those boards instead.
[See discussion here.](http://shop.prusa3d.com/forum/software-f13/enabling-auto-leveling-in-firmware-t416-s40.html)

Update the Hephestos 2 default config

fix spelling

Thermister -> Thermistor

Add pt_pt-utf8 language pack and fix some minor compiler warnings

follow-up the commit b82d91e

Fix extrudernum in MSG_INVALID_EXTRUDER

This is quite comprehensive. If probes are disabled in any case when they shouldn't be, I'm sure we will hear about it soon.

Delta-compatible extensions to M48

Added missing translations.

Stop print timer with M105/M109

Fix KEEPALIVE_STATE

follow-up the commit b82d91eca6

SERIAL_ECHO is not very good in printing uint8_t - so cast. to int.

Add return to NOT_BUSY for M105
Replace WAIT_FOR_USER with PAUSED_FOR_USER

Add Travis test for FILAMENTCHANGEENABLE

Improve the descriptions for THERMAL_PROTECTION

follow-up the PR #3180, #3183

Czech language specific changes

Patch drain_queued_commands_P

Fix a SNAFU that should have been caught in #3012

Also closes #3181.

Include M665 "ABC" parameters in EEPROM

The PrintrBoard Rev F utilizes a mcp4728 DAC to set motor current. Printrbot's implementation utilizes 2 new M-codes to set and write the DAC settings to the DAC EEPROM: `M909` (Read DAC) and `M910` (Write DAC). `M907` is re-used to set value, `M908` for direct control.

The Pins file for the RevF board is included.

Addressing #2773

Use const parameters in lcd_implementation_drawedit (etc.)