[EGD-6528] Unused keys cleanup from language files

We should not have unused keys now in code

[EGD-6267] Create Technical Information Window

Add Technical Information Window to display tech info on Pure.

[EGD-6266] Create Certification Window

Add Certification Window to display certification information.

[EGD-6264] About Your Pure Main Window

Add window About Your Pure to help display Technical Information,
Certification and SAR.

[EGD-6009] Test and repair Update process

Fixes to improve Update process.

[EGD-5936] Add Edit Quotes Window

This window is needed by the user to assist the user in editing quotes
or/and selecting the quotes categories to display.

[EGD-5968] Fix PowerOff window

PowerOff window lifting done
to comply with given design.

[EGD-5771] Create post update info window

Add post update info window.

[EGD-5756] Add Update Window

Create Update Window(s) to control and visualize the MuditaOS update
process on Pure.

[EGD-5737] Merge master into experimental

Keep experimental up to date with changes from master

[EGD-5737] Merge master into experimental

Keep experimental up to date with changes from master

[EGD-5737] Merge master into experimental

Keep experimental up to date with changes from master

[EGD-5737] Merge master into experimental

Keep experimental up to date with changes from master

[EGD-5295] Fixes in Calllog app

Fixed some Calllog UI issues:
Fixed lack of calllog entry after call aborting

[EGD-5295] Change the date format

Change the date format separator from / to .

[EGD-5398] Added onBoarding application first version

Created first version of onBoarding application. Added welcome
window, configuration start window and adopted language
window. Small Icon GUI refactor. AppManager language copy removed.

Merge branch 'master' into stable

[EGD-5250] Change time format on home screen and status bar

This commit changes time format displayed on home screen 
and on status bar by adding new locale for 12H format, 
which excludes am/pm suffix.
The new locale is set as new default format for time string.

Minor: Grammar typo fixed.

Merge commit 'c7dd6b399' into stable

Merge branch 'master' into stable