[Bug] Language hard coded to english in SSML-generation

[Megamannen]

lobe-tts/src/core/utils/genSSML.ts

Line 36 in ad9e283

`<speak version="1.0" xmlns="http://www.w3.org/2001/10/synthesis" xmlns:mstts="https://www.w3.org/2001/mstts" xml:lang="en-US">${input}</speak>`;

This should probably be xml:lang='${locale}' and not always english. (I think this is why it can decide to speak english if you have a lot of numbers in your text)

[lobehubbot]

👀 @Megamannen
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