Remove Android YEC strings

In firefox-android!58 (merged) I missed the strings. We should remove them.

Desktop strings have already been removed.

added Android Doing Localization labels

assigned to @pierov

changed title from Remove YEC strings that are still in the codebase to Remove Android YEC strings

mentioned in merge request firefox-android!65 (merged)

closed

removed Doing label

added Backport label

Backported to 13.0 as firefox-android@270303e3 and opened tpo/translation!51 (merged).

marked this issue as related to tor-browser-build#41075 (closed)

marked this issue as related to tor-browser-build#41061 (closed)