Fix GM Edit Person dialog crash due to missing Enhanced Imaging resource (Fixes #8708)

  PR Body:

  Root Cause

  The Enhanced Imaging (EI) option group was added to MegaMek's PilotOptions.java but the corresponding
  optionGroup.eiAdvantages resource string was never added to MekHQ's dialog properties files, causing a
  MissingResourceException when the dialog iterates through option groups.

  Changes

  1. CustomizePersonDialog.properties - Added missing optionGroup.eiAdvantages=Enhanced Imaging resource string
  2. CreateCharacterDialog.properties - Added missing optionGroup.eiAdvantages=Enhanced Imaging resource string

  Files Changed

  - MekHQ/resources/mekhq/resources/CustomizePersonDialog.properties - Added EI option group label
  - MekHQ/resources/mekhq/resources/CreateCharacterDialog.properties - Added EI option group label

  Testing

  1. Start new campaign (Veteran Preset)
  2. GM add a MechWarrior
  3. Right-click, GM -> Edit Person
  4. Dialog opens without error
  5. "Enhanced Imaging" group appears in Abilities tab

  Fixes #8708

Author: HammerGS

MekHQ/resources/mekhq/resources/CreateCharacterDialog.properties

@@ -69,6 +69,7 @@ age=years old
 textBloodname.error=Generation Failed
 optionGroup.lvl3Advantages=Advantages
 optionGroup.edgeAdvantages=Edge
+optionGroup.eiAdvantages=Enhanced Imaging
 optionGroup.MDAdvantages=Warrior Augmentations
 txtDesc.title=Instructions
 panXpLeft.title=XP remaining

MekHQ/resources/mekhq/resources/CustomizePersonDialog.properties

@@ -70,4 +70,5 @@ age=years old
 textBloodname.error=Generation Failed
 optionGroup.lvl3Advantages=Advantages
 optionGroup.edgeAdvantages=Edge
+optionGroup.eiAdvantages=Enhanced Imaging
 optionGroup.MDAdvantages=Warrior Augmentations