Revert "Add ability to skip display of submenus"

This reverts commit 13264a7c8bb820a2080d34ece56c31bcdf42a678.
Revert "CSS: Remove uppercase transform on menu headings"

This reverts commit c1feb96ab3ee8ad7e6e4a7f1a0d986b763510ef3.
Revert "Move menu generation functionality into Menu Class and update CSS"

This commit was merged without approval or review from the team, and
introduced several regressions and issues, documented in

- Issue #17712: errors in menu and submenu display
- Issue #17779: New Menu Class is breaking plugins

See also issue #17711 and comments in pull request #316.

This reverts commit 29c2f8211de8869b3b1b072467b54252d0db5024.
Localisation updates from https://translatewiki.net.
Use issue instead of bug in language file

Replace "Copy bug notes" with "Copy issue notes".
Fix "Workflow Transitions" override marking

Again caused by recent regressions from 7094372255c5aa89787cc105c31c9e1f7daa649e

- There was still usage of old config options that were deprecated.
- HTML elements were generated with multiple class attributes.
- When retrieving global configs use ALL_USERS instead of null (default user).

Fixes #17658
Change 'colour' to 'color'

Renamed the variables and function names within the workflow config pages modified in this pull request.
Fix php error for undefined t_workflow variable
Fix showing of workflow transitions

The workflow transition were not being shown due to accessing the wrong variables when rendering the page.

Fixes #17658