fix(history-queries): use uiLang for dates and capitalize first letter

[alexpnrv]

Problem:
MyHistory was displaying dates using the lang parameter from SnippetConfig. In languages like Spanish, toLocaleDateString returns lowercase day names, so UI dates looked incosistent.

Solution:

• Use the uiLang parameter from SnippetConfig for all UI date formatting
• Capitalize the first character of the date string to ensure proper display in languages where toLocaleDateString does not automatically capitalize.
• Fallback to props.locale if uiLang is not provided.

Before:
miércoles, 19 de octubre de 2022

After:
Miércoles, 19 de octubre de 2022

Notes:

• No visual or functional changes outside of the date capitalization and locale usage.
• Fully backwards compatible; Englisch and other languages that capitalize automatically remain unaffected.