Replace hand-rolled i18n with Fluent.

locales/render/en.ftl

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+render-archive = Archive
+render-pagination-label = Pagination
+render-pagination-newer = newer
+render-pagination-older = older
+render-notFound-message = The requested preview page could not be found.
+render-notFound-back = Back to preview home
+render-photoArchive-empty = No photos found for this archive.
+render-gallery-empty = No linked images found.
+render-tagCloud-empty = No tags found.
+render-tagCloud-ariaLabel = Tag cloud
+render-calendar-open = Open calendar
+render-calendar-close = Close calendar
+render-calendar-title = Archive calendar
+render-calendar-loading = Loading calendar…
+render-calendar-error = Calendar data could not be loaded.
+render-taxonomy-ariaLabel = Taxonomy
+render-backlinks-label = Linked from
+render-backlinks-ariaLabel = Backlinks
+render-languageSwitcher-ariaLabel = Language
+render-video-youtubeTitle = YouTube video
+render-video-vimeoTitle = Vimeo video
+render-month-1 = January
+render-month-2 = February
+render-month-3 = March
+render-month-4 = April
+render-month-5 = May
+render-month-6 = June
+render-month-7 = July
+render-month-8 = August
+render-month-9 = September
+render-month-10 = October
+render-month-11 = November
+render-month-12 = December
+render-search-placeholder = Search...
+render-search-ariaLabel = Site search