[MOS-939] Apply target update scripts

* Removed old UDM-related update scripts that are no longer needed.
* Applied target update script
* Removed unneeded data folder from user partition
* Removed dummy personalization.json

[BH-1639] Add welcome message with charging info

Add new bell welcome window
Add new close reasons
Add new actions
Bump assets version
Remove bold text from welcome message
Remove bold text from onboarding popups

[CP-1836] Lack of error handling for audio playback

Added error handling for incorrect audio formats and corrupted files inside Relaxation app

[MOS-874] Complement French translations

Additionally, deleted an unused translation item from
all languages.

[MOS-190] Add missing translations for EULA

Added missing EULA translations in Spanish.
Adjustment of the amount of share capital.

[CP-1831] Editing contact which is deleted via Center can still be saved but with incomplete data

Fix for editing contact when it was deleted via Center.
Edited contact cannot be saved if it was deleted earlier. Proper communication is shown.
Fix for phonebook app was not handling database notifications correctly.

[MOS-166] Unify grey color levels

Unified gray color levels used for texts
displayed in GUI.
Fixed issue with 'No calls yet.' text
not displaying.

[MOS-920] Fix incorrectly displayed Swedish texts in Onboarding

Fix of the issue that some of the Swedish
translations were incorrectly displayed
in Onboarding - some were misaligned
and some didn't display at all.

[MOS-190] Add missing translations for EULA

Added missing EULA translations in French and Swedish.

[MOS-901] Missing translation for words "show" and "replace"

Fix for missing translation for words "show" and "replace" in all
languages except for English.

[MOS-77] Notifications on the home screen shouldn't be bolded

Fix for bolded notification text in every language.

[MOS-663] Replacement for empty templates screen

Now there's information displayed that there are no
templates and in order to add some, the user needs
to use Mudita Center. Also, given no templates, the
screen doesn't show the 'USE' button.

[MOS-893] Fix invalid time description in the SMS thread

The sending/receiving time information will be displayed as follows:
- Only an hour –> for today
- Yesterday and hour –> for messages received/sent yesterday
- Day of the week and hour –> for messages received/sent within
last 7 days
- Date (day+month) and hour –> for messages older than week,
but still from the same year
- Date (day+month+year) and hour –> for messages
rom previous years

[MOS-161] Fix broken translations

Fix of the broken French translation that
appeared only partially on 'Configure
passcode' window during onboarding.

Also minor fixes in other translations
I noticed while using the phone.

[CP-1734] Create factory reset reboot UI

Create window that will be shown when the
device turns off first time after factory
reset request made from PureOS.

[MOS-803] DeviceInfo endpoint update

* Added some changes to the DeviceInfo endpoint
* Updated relevant code accordingly
* Removed unneeded paths definitions
* Minor bug fixes

[MOS-783] Change boot.bin to os.bin

Change the confusing system binary name.

[MOS-785] Reworked updater dependencies into recovery

Fixed usage of updater in OS build flow to use recovery

[MOS-786] Added support for A/B boot codes in OS

Further implementation of A/B booting

[MOS-783] First part of new dir structure implementation

    Works:
    - generating .img for Pure;
    - Pure boots after flashing new image and
    seems to be working fine;

    Not yet:
    - generating update package;
    - generating image for Harmony;
    - simulator;
    - path-related unit tests fail
    due to paths being hardcoded
    in test scenarios.