Align a11y_* strings with Element X project in Localazy

[t3chguy]

Requires #11436
For element-hq/element-web#25608

Performed using

set -e

replace () {
    K="${1/./|}"
    find src/i18n/strings -type f -exec sh -c "jq '.$1 = .\"$2\" | del(.\"$2\") | del(..|nulls) | del(..|select(. == { }))' {} | sponge {}" \;
    find src -type f -exec gsed -i -E "s/(_td?)\(\"$2\"\)/\1(\"$K\")/gm;t" {} \;
    find src -type f -exec grep -E "(_td?)\(\"$2\"\)" {} \;
}

# Consume EX a11y strings
replace "a11y.user_menu" "User menu"

prettier --log-level silent --write src/
prettier --log-level silent --write src/i18n/strings/ --ignore-path /dev/null
yarn i18n

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This change is marked as an internal change (Task), so will not be included in the changelog.