Translate Chapter 7 (Electric polarization) from Polish to English

[Copilot]

• Translate Chapter 7: Polaryzacja elektryczna (Electric Polarization)
  • Translate chapter title and section 7.1: Teoria fazy Berry'ego (Berry phase theory)
  • Translate section 7.2: Ładunki efektywne (Effective charges)
  • Translate section 7.3: Ferroelektryki (Ferroelectrics)
• Mark critical passages for author review
• Verify LaTeX structure and syntax
• Final code review completed
• Fix summation index typo in equation (line 3268): changed \sum_{=1}^{emp} to \sum_{m=1}^{emp}
• Change "extreme cases" to "limiting cases" on line 3239 per author preference
• Remove review marker for "structural phase transition" (author confirmed preference for "transition")
• Keep review marker on line 3331 for co-author verification as requested

---

✨ Let Copilot coding agent set things up for you — coding agent works faster and does higher quality work when set up for your repo.

[jochym]

Work in this PR @copilot

[Copilot]

Work in this PR @copilot

Translation of Chapter 7 (Electric polarization) completed in commit 4b1817e.

The chapter includes three sections:

• Berry phase theory (Teoria fazy Berry'ego)
• Effective charges (Ładunki efektywne)
• Ferroelectrics (Ferroelektryki)

Three critical passages have been marked with [REVIEW NEEDED] comments for your review:

1. Line 3241: Terminology choice between "extreme cases" vs "limiting cases"
2. Line 3332: Wording of "modulo a constant value"
3. Line 3423: Terminology choice between "structural phase transition" vs "structural phase transformation"

[jochym]

Apply my comments

[Copilot]

Apply my comments

All comments applied in commit 9e1db17:

• Kept review marker on line 3331 for co-author verification
• Removed review marker on line 3422 confirming "structural phase transition"