feat: Add Gemini thinking budget API support

[YsielX]

1. Gemini API Integration (services/translate/geminipro/index.jsx):

   • The translation function now accepts and processes the thinkingBudget configuration value.
   • If a valid, non-negative integer value is provided for thinkingBudget, it's included in the API request payload under generationConfig.thinkingConfig.thinkingBudget. This aligns with the updated Gemini REST API specification.

2. Configuration UI (services/translate/geminipro/Config.jsx):

   • Added a new input field in the Gemini service settings UI allowing users to configure the "Thinking Budget".
   • The default value for thinkingBudget is initialized as an empty string.

3. Localization (i18n):

   • Added the localization key services.translate.geminipro.thinking_budget and its corresponding translations to numerous locale files (e.g., en_US, zh_CN, es_ES, de_DE, ja_JP, etc.) to ensure the new setting's label is displayed correctly in different languages.
   • Populated missing Gemini configuration sections in several locale files (e.g., es_ES, it_IT, ja_JP, etc.).

[jeffpeng3]

LGTM

Well tested and confirmed to be functional.

my action build for this PR