[CP] Happy Pet Birthday Letter Mod 1.6.15

The Happy Pet Birthday Letter mod introduces a pet-themed birthday letter to Stardew Valley. By default, a dog sends a birthday letter on Spring 20, including a Dog Treat. The letter itself is composed of dog sounds for a humorous surprise. Players have the option to enable a cat letter instead, or to receive letters from both a dog and a cat. Each pet type has its own configurable date, allowing for separate "birthday" days for dogs and cats.

Key features of this mod include the addition of a pet birthday letter from a dog, with an optional letter from a cat. The dog letter is enabled by default, while the cat letter can be enabled through the configuration. Both dog and cat letters have independently configurable seasons and days. The mod also adds two edible items, Dog Treat and Cat Treat, whose sell price and edibility are configurable. It offers i18n support for item names, descriptions, and mail text, and can be configured via config.json or Generic Mod Config Menu. It is a Content Patcher pack.