feat(i18n): localize remaining image zoom controls in files view

Co-authored-by: christianlouis <361235+christianlouis@users.noreply.github.com>

frontend/translations/en.json

@@ -729,6 +729,7 @@
   "files.js_pdf_page_info": "Page {page} of {total}",
   "files.js_prev_page": "« Prev",
   "files.js_preview_fallback": "Preview",
+  "files.js_reset_zoom": "Reset zoom",
   "files.js_search_results_count": "{total} result(s) for \"{query}\"",
   "files.js_search_unavailable": "Search unavailable: {error}",
   "files.js_searching": "Searching…",
@@ -738,6 +739,8 @@
   "files.js_select_files_reprocess": "Please select files to reprocess",
   "files.js_untitled": "(untitled)",
   "files.js_view_file": "View file",
+  "files.js_zoom_in": "Zoom in",
+  "files.js_zoom_out": "Zoom out",
   "files.no_files": "No files found",
   "files.ocr_status": "OCR Status",
   "files.page_title": "File Records",