Add french, italian, portuguese, spanish, german (#155)

The french 6 layers variant wasn't included because it's not good enough
yet. Use the `french_24l` variant for now.

docs/API Reference/python-api.md

@@ -37,16 +37,18 @@ The main class for text-to-speech generation.
 
 #### Class Methods
 
-##### `load_model(config="b6369a24", temp=0.7, lsd_decode_steps=1, noise_clamp=None, eos_threshold=-4.0)`
+##### `load_model(language=None, config=None, temp=0.7, lsd_decode_steps=1, noise_clamp=None, eos_threshold=-4.0, quantize=False)`
 
 Load and return a TTSModel instance with pre-trained weights.
 
 **Parameters:**
-- `config` (str): Path to model config YAML file or a variant identifier (default: "b6369a24")
+- `language` (str | None): Name of built-in language config to load. Supported values: `"english_2026-01"`, `"english_2026-04"`, `"english"`, `"french_24l"`, `"german_24l"`, `"portuguese_24l"`, `"italian_24l"`, `"spanish_24l"`. If both `language` and `config` are omitted, defaults to `"english"`, which is the same model as `"english_2026-04"`. The "24l" variants are larger models that are not distilled yet and are here only as a preview.
+- `config` (str | None): Path to model config YAML file. Incompatible with `language`.
 - `temp` (float): Sampling temperature for generation (default: 0.7)
 - `lsd_decode_steps` (int): Number of generation steps (default: 1)
 - `noise_clamp` (float | None): Maximum value for noise sampling (default: None)
 - `eos_threshold` (float): Threshold for end-of-sequence detection (default: -4.0)
+- `quantize` (bool): Enable int8 quantization when loading the model (default: `False`)
 
 **Returns:**
 - `TTSModel`: Loaded model instance on CPU
@@ -59,7 +61,9 @@ from pocket_tts import TTSModel
 model = TTSModel.load_model()
 
 # Load with custom parameters
-model = TTSModel.load_model(variant="b6369a24", temp=0.5, lsd_decode_steps=5, eos_threshold=-3.0)
+model = TTSModel.load_model(
+    language="english_2026-01", temp=0.5, lsd_decode_steps=5, eos_threshold=-3.0
+)
 ```
 
 #### Properties
@@ -255,4 +259,4 @@ scipy.io.wavfile.write("batch_output.wav", model.sample_rate, full_audio.numpy()
 ### Streaming to File
 You can refer to our CLI implementation which can stream audio to a wav file.
 
-For more information about the command-line interface, see the [Generate Documentation](generate.md) or [Serve Documentation](serve.md).
+For more information about the command-line interface, see the [Generate Documentation](generate.md) or [Serve Documentation](serve.md).