Creates a hook and associated data structure to support translating static app strings based on the selected language.

Addresses part of #84.

Todo:

• Create a hook and context to support providing static app strings in the selected language.
• Adjust existing pages with static app strings to utilize the useLocalization hook.
• Update getAppStringValue utility function to support argument replacement for dynamic string content that is rendered within static app strings.
• Create a language selector component that calls setLanguageCode from the useLocalization hook to set the language code.
• Translate static app strings into additional languages that need to be supported.