only for CE-specific contents under /app/assets/javascripts/[p-s]

- Updates Epic sidebar collapse button icon to be
consistent with Issue sidebar.
- Fixes loading icon visibility.

- `cssClasses` is redundant because `class`
  values are merged with the root element anyway.
- `width`, `height`, `x`, `y` are redundant and
  will all pass through.
- `tabIndex` is redundant because `tabindex` can
  be passed through.

https://gitlab.com/gitlab-org/gitlab/merge_requests/17839

Currently, we label items to be done as "Todo." This is grammatically
incorrect and (therefore) confusing—especially to our Spanish-speaking
users for whom "todo" has a specific and unrelated meaning.

We should use "To Do" and always use it as singular (not "To Dos").

Updates to wording in a few places per MR (ee) discussion

Updating locale/gitlab.pot

Updates to wording in a few places per MR (ee) discussion

Updating locale/gitlab.pot

Currently, we label items to be done as "Todo." This is grammatically
incorrect and (therefore) confusing—especially to our Spanish-speaking
users for whom "todo" has a specific and unrelated meaning.

We should use "To Do" and always use it as singular (not "To Dos").

Updates to wording in a few places per MR (ee) discussion

Updating locale/gitlab.pot

Updates to wording in a few places per MR (ee) discussion

Updating locale/gitlab.pot

This reverts commit 13a267b9.

This reverts commit 8717c7da.

This reverts commit 79d64720, reversing
changes made to 41c3e005.

# Conflicts:
#	app/models/group.rb
#	ee/app/services/ee/todo_service.rb
#	ee/spec/features/epics/todo_spec.rb

This reverts commit 4d9a3f42, reversing
changes made to ecf9c145.