Adds ``=id`` to PageAdmin.search_fields
Merge pull request #2964 from Chive/feature/page-search-by-id

Search by exact id in Page Admin
fixes js button switch
Merge pull request #2967 from digi604/fix-2904

fixes js button switch
fixes partially #2939
Merge pull request #2968 from digi604/fix-2939

fixes partially #2939