Add spanish translation and code improvements

[edfloreshz]

This pull request includes several changes to add localization support for Spanish and its regional variations, as well as some modifications to the application settings and menu bar. The most important changes are summarized below:

Localization support:

• Added Spanish (Spain) localization strings in i18n/es/tasks.ftl.
• Added Spanish (Mexico) localization strings in i18n/es-MX/tasks.ftl.
• Added Spanish (Latin America) localization strings in i18n/es-419/tasks.ftl.

Application settings and menu bar:

• Modified item_width in the menu_bar function in src/app/menu.rs to increase the width from 240 to 260.
• Refactored the settings function in src/app/settings.rs to separate the initialization logic into a new init function.
• Updated the main function in src/main.rs to call the new init function before running the application.