XF 2.x AI Phrase Translation - Product updates

Fixed an issue with model naming change in OpenRouter API causing error.

Added option to delete existing translations based on add-on.

Added OpenRouter API where you can use the AI models that you want.
Added back the custom prompt admin option.

Added "system" role and refined the prompt, removing the need for a custom prompt option which has been removed.

Fixed a JS error for individual phrase translation.

Added latest GPT-4o as a new option.
This version is compatible with XF 2.3 only.

Made a change to the default prompt to fix an issue where the response could contain unnecessary explanations or asking for context, using more tokens than needed.

Fixed an issue with empty response error caused by empty phrases.

Fixed an issue with the translation button displaying on empty phrases.
Fixed an issue with making API requests on empty phrases.

Added GPT-4 turbo model option.
Added option to use your own custom prompt.
Mass translation process will now display the number of phrases that will be translated and the number of phrases translated so far.
Made a performance improvement by removing a query.