Private messages in MUC don't get sent to the right resource if it contains certain characters

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**Describe the bug**
Bifrost seems to be mangling and/or prepping incorrectly certain characters when sending stanzas.

**To Reproduce**
Steps to reproduce the behavior:
1. Join xmpp@chat.yax.im
2. Attempt to privately message jonas’‎
3. Message gets sent to "jonas 19" which doesn't exist

**Expected behavior**
The message should be sent to jonas’

**Additional context**
Some logs about the issue

Bifrost:
Jul-29 08:19:05.390 INFO MatrixEventHandler Handling IM message
Jul-29 08:19:05.391 INFO MatrixEventHandler Sending IM to xmpp@chat.yax.im/jonas 19
Jul-29 08:19:05.392 INFO XmppJsGateway Looking up possible gateway: @maranda:aria-net.org xmpp@chat.yax.im/jonas 19 xmpp@chat.yax.im

XMPP Server:
Jul 29 08:19:05 jcp55df4cc03bb0 debug Received[component]:
Jul 29 08:19:05 s2sout55df4b10b5c0 debug sending:
Jul 29 08:19:05 s2sout55df4b10b5c0 debug Received[s2sout]:

Start by tracing the private-message path through the MatrixEventHandler and XmppJsGateway entries shown in the logs, then reproduce the case with the resource name jonas’‎. Done means the generated XMPP stanza preserves the intended resource and the private message reaches jonas’‎ instead of jonas 19.

Written by the indexing model from the issue text.