Include "English (The Gambia)" in UI

[Candice-Louw]

Feature Description

Users in the Gambia would like to make use of SORMAS in English (The Gambia). In order to make this visible on the UI, the option for "English (The Gambia)" needs to be included in the user language (User Settings > Language) dropdown.

The language has been introduced on CrowdIn (https://crowdin.com/project/sormas/en-gm).

Added Value/Benefit

This feature would allow localisation of SORMAS UI content based on end user needs.

Acceptance Criteria

• [ ] "English (The Gambia)" is added to dropdown values found at: User Settings > Language
• [ ] "English (The Gambia)" is placed directly after "English" so that all English languages are grouped
• [ ] The Gambia flag thumbnail is added: https://github.com/gosquared/flags/blob/master/flags/flags-iso/shiny/64/GM.png
• [ ] Local date and time formats conform to en-GM, "dd/MM/yyyy", "dd/MM/yyyy HH:mm", "dd/MM"
• [ ] SORMAS UI is translated and displayed in the language when it is selected from the list
• [ ] Individual system users are able to select and set the language as their language of choice when setting up/configuring a new user (user management)

Implementation Details

Similar to https://github.com/SORMAS-Foundation/SORMAS-Project/issues/4449 with https://github.com/SORMAS-Foundation/SORMAS-Project/pull/4759, and https://github.com/SORMAS-Foundation/SORMAS-Project/issues/9042 with https://github.com/SORMAS-Foundation/SORMAS-Project/pull/9578, and https://github.com/SORMAS-Foundation/SORMAS-Project/issues/11862 with https://github.com/SORMAS-Foundation/SORMAS-Project/pull/11867.

Related: https://github.com/SORMAS-Foundation/SORMAS-Project/issues/13091

Mockups

No response

Additional Information

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