Added Language-Specific Placeholders and Prompts for Scribe Keyboard

[akshayw1]

Contributor checklist

• This pull request is on a [separate branch](https://docs.github.com/en/get-started/quickstart/github-flow) and not the main branch
• I have tested my code with the ./gradlew lintKotlin detekt test command as directed in the [testing section of the contributing guide](https://github.com/scribe-org/Scribe-Android/blob/main/CONTRIBUTING.md#testing)

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Description

This PR addresses a major issue for adding functionality to the Scribe keyboard. It ensures that all labels and placeholder texts are added for the command buttons in the Scribe-Android keyboard, while also considering language-specific prompts from the helper files. Here's what was implemented:

• The user presses the Scribe key and selects a command.
• Instead of just a text input, a proxy with a label and greyed-out placeholder text is shown.
• The placeholder text is replaced once the user starts typing.
• If the user deletes all the text, the placeholder text reappears.
• The label text within the proxy cannot be deleted (only editable once the user starts typing).

Modular Code and Language Support:

• The changes have been modularized to ensure that the placeholders and prompts are dynamically fetched based on the language of the keyboard.
• Language-specific helper files (e.g., ENInterfaceVariables, FRInterfaceVariables, etc.) are used to handle prompts and labels in the corresponding language.
• The structure ensures the keyboard adapts seamlessly to various languages without code duplication, making it scalable for future language additions.

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Screenshots of Changes

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Testing

• Manual Testing: I have manually tested the functionality to ensure that the placeholder text behaves as expected (appears initially, disappears when typing, reappears if text is deleted) in different languages.
• Language-Specific Testing: Ensured that placeholders and prompts are fetched correctly based on the selected keyboard language using the helper files for each language.
• Linting: Ran ./gradlew lintKotlin and resolved any lint issues.
• Build Compatibility: The build passes without issues, and no regressions were found during testing.

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Related issue

• Add text proxy labels and placeholder texts for all commands #271

[github-actions]

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Maintainer checklist

• The linting and formatting workflows within the PR checks do not indicate new errors in the files changed

• The CHANGELOG has been updated with a description of the changes for the upcoming release and the corresponding issue (if necessary)

[github-actions]

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[andrewtavis]

All's working really well here, @akshayw1, and this is a great first step to getting the command functionality up and running! I'll be making a few issues based on the current state of the application right now. Maybe these include the work that needs to be done you were referring to, but of course let me know if there are other issues you think we need to make! Also feel free to pick up another issue 😊