* feat(chapter): add "mark all as read" option
Added new translation key for "Mark all as read" and updated ChaptersToolbarMenu to use it in the tooltip when marking all chapters as read.
* refactor(i18n): create global download key for generic actions
* feat(i18n): add filter and sort string to chapter toolbar
* fix(i18n): update tooltip text for clear selection action
* apply `yarn lint --fix`
The loading placeholder was never removed in case the whole source catalogue was added to the library and the "hide entries in library" setting has been enabled.
