In process of T177432 it was identified that 'find' icon of 'editing-advanced' should be merged with 'articleSearch' in 'content'.
After Gerrit Patch is merged on icon overhaul at T177432, we need to deprecate and remove 'find'
[x] Replace icon file of 'find' of 'editing-advanced' with 'articleSeach' of 'content' in OOUI – T177432
 Deprecate 'find':
[ ] Replace instances whereever used, currently: 1x @ [[ https://codesearch.wmflabs.org/search/?q=%3A%20%27find%27&i=nope&files=&repos= | Extension:CodeEditor ]]
[ ] Remove 'find':