N°2039 - Rework view all notifications page (#617)

* N°2039 - Rework view all notifications page

* N°2039 - Replace modals with toasts

* N°2039 - Add bulk mode to view all notifications page

* Apply suggestions from code review

Co-authored-by: Molkobain <lajarige.guillaume@free.fr>

* Apply suggestions from code review

Co-authored-by: Molkobain <lajarige.guillaume@free.fr>

* Apply suggestions from code review

Co-authored-by: Molkobain <lajarige.guillaume@free.fr>

* Apply suggestions from code review

Co-authored-by: Molkobain <lajarige.guillaume@free.fr>

* Apply suggestions from code review

Co-authored-by: Molkobain <lajarige.guillaume@free.fr>

* Update css/backoffice/pages/_notifications.scss

* Update dictionaries/ui/application/newsroom/fr.dictionary.itop.newsroom.php

* Apply suggestions from code review

Co-authored-by: Molkobain <lajarige.guillaume@free.fr>

* Add since in phpdoc

* Change newsroom empty notification illustration

* N°2039 - Refactor code to factorize logic

---------

Co-authored-by: Molkobain <lajarige.guillaume@free.fr>

css/backoffice/utils/variables/_typography.scss

@@ -15,6 +15,9 @@ $ibo-font-size-400: 2rem !default; /* 24px */
 $ibo-font-size-450: 2.5rem !default; /* 30px */
 $ibo-font-size-500: 3rem !default; /* 36px */
 $ibo-font-size-550: 4rem !default; /* 48px */
+$ibo-font-size-600: 5rem !default; /* 60px */
+$ibo-font-size-650: 6rem !default; /* 72px */
+$ibo-font-size-700: 7rem !default; /* 84px */
 
 /* Value	Common weight name (https://developer.mozilla.org/en-US/docs/Web/CSS/font-weight) */
 $ibo-font-weight-100: 100 !default; /* 100 Thin (Harline) */