Configure all of `GlPagination`'s labels

What does this MR do and why?

Configure all of GlPagination's labels

GlPagination now exposes all of its internal labels for translation via the configuration. This ensures all of them are properly passed to GitLab UI so we can benefit from translated labels by default.

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Screenshots or screen recordings

In some cases, this has user-facing effects where the Prev labels are replaced with Previous, which adhered to our accessibility guidelines: #457873 (comment 1878930318).

Before	After

Related to #457873 (closed)