Add spell DBC base exclusion tooltips

[Thanhdn1984]

Summary

• Replace TODO tooltips for the spell_dbc base exclusion aura fields
• Add English i18n strings for caster/target exclusion aura state and spell fields

Fixes part of #1190.

Verification

• git diff --check
• attempted: npx nx test spell --testFile=spell-dbc/base/spell-dbc-base.component.spec.ts --watch=false (blocked: dependencies not installed in clean clone)