[kojdad-alt]

Improves the Czech translation in messages_cz.yml and help_cz.yml.

• Translates the strings that were still in English: dialog.login.canceled, dialog.register.canceled, error.kick_unresolved_hostname and the help header.
• Fixes the time units used by %time in email.email_cooldown_error. The singular forms were genitive ("1 sekundy", "1 dny") and days was misspelled ("dnu"). They now read "1 sekundu / 1 minutu / 1 hodinu / 1 den" and "sekund / minut / hodin / dní", and the cooldown message is reworded so these forms fit.
• Fixes mistranslations: password.wrong_length claimed a fixed minimum of 4 characters, session.invalid_session told the player to wait for the session to expire instead of saying the IP changed, and misc.reload only mentioned the settings.
• Fixes typos and grammar (dokuď, přílíš, Špatné opsána, jsi se, pro tomto účtu, oskenovat, missing commas).
• Uses the informal "ty" form everywhere. The dialog and premium strings used the formal "vy" form, while the rest of the file uses "ty".
• Success messages (registration, login, logout, password change, reload, session, captcha) now use &2 like messages_en.yml instead of red &c.

All placeholders are kept. I checked that every key in messages_en.yml has the same set of % tags in messages_cz.yml, and that both files still parse as YAML.

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