scripting: investigate behaviour of title setting with degree symbol

# Issue Description

On POLARIS a title was set containing a degree symbol
```
g.change_title("Pos3: M 400°C-treated calcium iridium niobium oxide pyrochlore in 6 mm V foil can, RT")
```
But the .xml file shows this as `"Pos3: M 400÷"` or

The title also looks odd in the NeXus file too. This needs tracing through the logic to see where UTF-8 is not being preserved (Polaris journal_25_5.xml file, polaris00162323.nxs)

# Acceptance Criteria

A title can be set using any valid UTF8 character

## note

There have been issues in the past with non-ascii characters, I though it had been working but would need to look further. Past issues have revolved around different windows code pages e.g. labview used https://en.wikipedia.org/wiki/Windows-1252 i think not utf-8