Extract character creation stat prompts

[eugene-lesnov]

Summary

I18N "Extract character creation stat and skill input prompts"

Purpose of change

Some prompts in character creation still show up in English without translation:
Set new strength (between 4 and 20):

The stat and skill input prompts are not passed through gettext, and the stat name in the stat prompt is not translated either.

Describe the solution

Make the stat and skill input prompts translatable.

For stats, also pass the full stat name through gettext.
Skill names are already translated by skill_queried->name(), so nothing else is needed there.

Describe alternatives you've considered

None

Testing

Ran lang/update_pot.sh successfully.

Verified that both prompts are present in the generated translation template:

• Set new %s (between %d and %d):
• Set new %s skill level (between %d and %d):

Compiled src/newcharacter.cpp.

Additional context

None