Make interactive HTML tables localized to locale values given to gt()

[rich-iannone]

This PR makes it such that interactive HTML tables (usually activated via opt_interactive()) have localized labels/controls. As a simple test case, the following code will yield an interactive table with French-language labels/buttons:

gtcars %>% 
  gt(locale = "fr") %>% 
  opt_interactive(
    active = TRUE,
    use_pagination = TRUE,
    use_pagination_info = TRUE,
    use_sorting = TRUE,
    use_search = TRUE,
    use_filters = TRUE,
    use_resizers = FALSE,
    use_highlight = FALSE,
    use_compact_mode = FALSE,
    use_text_wrapping = TRUE,
    use_page_size_select = TRUE,
    page_size_default = 10,
    page_size_values = 50,
    pagination_type = "numbers"
  )

Fixes: #1308

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