Extract use actions of gun items for translation

[BrettDong]

Summary

None

Purpose of change

menu_text and msg in use_action embedded in GUN JSON definition is not translated.

{
    "id": "compbow",
    "looks_like": "longbow",
    "type": "GUN",
    "symbol": "(",
    "color": "yellow",
    "name": { "str": "compound hunting bow" },
    "use_action": {
      "menu_text": "Tighten Limbs", // <---
      "type": "transform",
      "target": "compbow_high",
      "qualities_needed": { "SCREW_FINE": 1 },
      "msg": "You tighten the limbs, increasing the strength of the bow.", // <---
      "ammo_scale": 0
    }
}

Describe the solution

Update string extractor script.

Describe alternatives you've considered

Testing

These text now appear in the generated translation template.

#. ~ "menu_text" action message of item "compound hunting bow"
#. ~ "menu_text" action message of item "compound hunting bow (low)"
#: data/json/items/ranged/archery.json
msgid "Tighten Limbs"
msgstr ""

#. ~ "msg" action message of item "compound hunting bow"
#. ~ "msg" action message of item "compound hunting bow (low)"
#: data/json/items/ranged/archery.json
msgid "You tighten the limbs, increasing the strength of the bow."
msgstr ""

Additional context