Fix grammar and format specifiers in string resources

[Copilot]

Summary

Fixed grammar issues in the localization string resources for both English and Vietnamese translations.

Changes

English (values/strings.xml)

• Before: "Now is %1s"
• After: "It is now %1$s"

Improvements:

1. Grammar correction: Changed "Now is" to "It is now" for proper English grammar
2. Format specifier fix: Added missing $ in the format specifier (%1$s instead of %1s)

Vietnamese (values-vi/strings.xml)

• Before: "Bây giờ là %1s"
• After: "Bây giờ là %1$s"

Improvements:

1. Format specifier fix: Added missing $ in the format specifier (%1$s instead of %1s)

Why These Changes Matter

1. Proper English grammar: The phrase "It is now [time]" is grammatically correct, while "Now is [time]" is awkward and non-standard English.

2. Correct Android format syntax: Android string resources require the positional format specifier to include the $ character (e.g., %1$s, %2$s). While %1s may work in simple cases, %1$s is the correct and recommended format, especially important when dealing with multiple arguments or complex formatting scenarios.

Testing

• All XML files validated successfully with xmllint
• String resource is properly used in DemoDateTimeFormatter composable with correct parameter passing
• No functional changes to the app behavior, only improved string quality

Fixes #10

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Original prompt

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This section details on the original issue you should resolve

<issue_title>Fix strings</issue_title>
<issue_description>Fix grammars of strings</issue_description>

Comments on the Issue (you are @copilot in this section)

Fixes #10

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