Use Home and Back to reset view in main screen

when menu is top menu, pages can be changed but no key to reset view -
so add home key and back key to reset view
Merge pull request #1 from Doudou14/Testing

Merge Doudou14's French Translations
[Revert] Clean Nozzle D.V. 2.0 by Doudou14

These changes should not be needed on the Da Vinci 2.0.
Can somebody with a 2.0 test and confirm this?
Revert "[Revert] Clean Nozzle D.V. 2.0 by Doudou14"

This reverts commit 51bb961d890ed42b87ccc8446cbdc549e9e9f92f.
[UNTESTED] Changes to Clean Nozzle for D.V. 2.0

I made some changes to the Nozzle Cleaning function to make it work with
DaVinci 2.0.

I do not own a 2.0, so if somebody who does can give me exact settings,
that would be great!
Blank LCD Issue Revisited

I have been having blank LCD issues with this set at 500ms, so I'm going
to try it again at 400ms which seemed to work better. I may mess with
these settings more later on to try to resolve this issue completely.
Changes for Auto-Leveling & Blank LCD Issue

This will make Auto-Leveling work better, and also allow for easier
Repetier-Host & Slicer Configuration.

Also changed UI_START_SCREEN_DELAY to 4000 (This seems to help the blank
LCD issue.)
Fix Nozzle Cleaning

There was an issue with nozzle cleaning function that will cause the
nozzle to hit the bed.

This is caused by the memorized position being set to 0 before homing,
which is then changed to -30 after homing, which caused the nozzle not
being returned to the proper position.
Fixed Position Menu LCD Corruption.

I forgot to change the number of menus when I removed the X,Y,Z Homing
in a previous commit, which caused the LCD to display corruption in the
"Positions" menu.
Merge pull request #4 from drbogger/Testing

Merge DrBogger