UI: Avoid using newlines in error messages

Some errors include HTML links directing users to e.g. driver updates
or further information. Using a raw newline instead of <br> causes Qt to
skip parsing the HTML, resulting in an ugly mess of HTML displayed to
the user instead of the intended links.

UI/data/locale/en-US.ini

@@ -420,7 +420,7 @@ Output.ConnectFail.Disconnected="Disconnected from server."
 # output streaming-related messages
 Output.StreamEncodeError.Title="Encoding error"
 Output.StreamEncodeError.Msg="An encoder error occurred while streaming."
-Output.StreamEncodeError.Msg.LastError="An encoder error occurred while streaming:\n\n%1"
+Output.StreamEncodeError.Msg.LastError="An encoder error occurred while streaming:<br><br>%1"
 
 # output recording-related messages
 Output.RecordFail.Title="Failed to start recording"
@@ -430,7 +430,7 @@ Output.RecordNoSpace.Msg="There is not sufficient disk space to continue recordi
 Output.RecordError.Title="Recording error"
 Output.RecordError.Msg="An unspecified error occurred while recording."
 Output.RecordError.EncodeErrorMsg="An encoder error occurred while recording."
-Output.RecordError.EncodeErrorMsg.LastError="An encoder error occurred while recording:\n\n%1"
+Output.RecordError.EncodeErrorMsg.LastError="An encoder error occurred while recording:<br><br>%1"
 
 # output recording messages
 Output.BadPath.Title="Bad File Path"

UI/window-basic-main.cpp

@@ -7730,8 +7730,8 @@ void OBSBasic::RecordingStop(int code, QString last_error)
 		errorDescription = Str("Output.RecordError.Msg");
 
 		if (use_last_error && !last_error.isEmpty())
-			dstr_printf(errorMessage, "%s\n\n%s", errorDescription,
-				    QT_TO_UTF8(last_error));
+			dstr_printf(errorMessage, "%s<br><br>%s",
+				    errorDescription, QT_TO_UTF8(last_error));
 		else
 			dstr_copy(errorMessage, errorDescription);