feat(slides): add enhanced translation with source language selection and translate-all functionality

[happygoluckycodeeditor]

Description

This contribution adds an enhanced translation feature for Google Slides that allows users to translate entire presentations with full control over source and target languages. Helps in quick translation of all slides. The code is based on the already existing sample app.

Use-case: Usually used in office scenarios to translate lots of slides and its elements quickly in one-go.

New files added:

• translateAllSlides.gs - Enhanced version with translateAllSlides() function to translate all slides at once
• sidebarEnhanced.html - Improved UI with source language selection and expanded language support

Key improvements:

• Added translateAllSlides() function to translate entire presentations in one click
• Expanded language support from 9 to 30+ languages
• Added source language selection with auto-detect option
• Two translation modes: translate selected elements or all slides
• Original translate.gs and sidebar.html remain unchanged (used in official documentation)

Fixes # (N/A - this is a new feature addition)

Is it been tested?

• [x] Development testing done

Checklist

• [x] My code follows the style guidelines of this project
• [x] I have performed a self-review of my own code
• [x] I have performed a peer-reviewed with team member(s)
• [x] I have commented my code, particularly in hard-to-understand areas
• [x] I have made corresponding changes to the documentation
• [x] My changes generate no new warnings
• [x] Any dependent changes have been merged and published in downstream modules

[gemini-code-assist[bot]]

Summary of Changes

Hello @happygoluckycodeeditor, I'm Gemini Code Assist[^1]! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request significantly upgrades the Google Slides translation add-on by introducing an "enhanced" version. The primary goal is to facilitate quick and comprehensive translation of entire presentations, particularly useful in professional settings. It achieves this by offering a new sidebar interface that allows users to select both source and target languages (with an auto-detect option for source) and provides the choice to translate either selected elements or all text content across all slides, supporting a much broader range of languages.

Highlights

• Enhanced Translation Functionality: Introduces the ability to translate entire Google Slides presentations with a single click.
• Source Language Selection: Adds an option for users to explicitly select the source language or utilize an auto-detect feature.
• Expanded Language Support: Increases the number of supported translation languages from 9 to over 30.
• Dual Translation Modes: Provides two distinct modes: translating only selected elements or translating all text across all slides.
• New Files: Adds translateAllSlides.gs for backend logic and sidebarEnhanced.html for the new user interface.

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[happygoluckycodeeditor]

Working on the feedback! Thank you very much! Be right back! :D

[happygoluckycodeeditor]

@gemini-code-assist I have added/made the necessary changes. Can you have a look?

Also removed the Auto-detect thing because it does not serve much purpose when the person doing the translate already knows the content of the slide and is just trying to change it to another language.

[happygoluckycodeeditor]

Thanks for the feedback. I am not sure if all of the suggestions are worth it. I ran the script on a 50 page Japanese Presentation with lots of text and the script did not time-out or went over the quota or give that sort of an error :D

• I added a function which ignores images (it was throwing errors if the shapes were images). The code is now properly updated. Hope that will be it!

P.S. Tested and reviewed by peers as well

[happygoluckycodeeditor]

@jpoehnelt Hello!
I made a small contribution and would love your feedback whenever you have time.
Totally understand if you're busy — thanks in advance~