Case T-823/17: Judgment of the General Court of 13 February 2019 — Etnia Dreams v EUIPO — Poisson (Etnik) [EU trade mark — Opposition proceedings — Application for EU word mark Etnik — Earlier EU trade mark — Relative ground for refusal — Failure to identify the earlier trade mark in the notice of opposition — Principle of sound administration — Right to an effective remedy — Equality of arms — Principle of good faith — Legitimate expectations]