Hand-fix UtBS po catalogues for typo correction

Commit 77025e1326f2af5fd702816c8088c47d828d8930 requires an unsupported
pofix change because the relevant substring appears twice with different
overall string contents, and it's impossible to provide pofix with the
full context and expect it to work due to catalog line wrapping.
pofix: Add convertion for HttT S23 typo fix

From commit 3d3e81036924cc4068330473e7374e74a4523d0a.