Merge pull request #32923 from overleaf/mfb-replace-placeholders-with-helper-text-bibtex-form

[web] Replace placeholders with helper text in BibTeX entry form

GitOrigin-RevId: b7d4fef0414bc79abda6fba2c4c9594edd9f05fc

services/web/frontend/extracted-translations.json

@@ -284,6 +284,7 @@
   "choose_how_you_search_your_references": "",
   "choose_which_experiments": "",
   "citation": "",
+  "citation_key_helper": "",
   "cite_a_reference_from_your_reference_manager_to_automatically_add_it_to_your_bib_file": "",
   "cite_directly_or_import_references": "",
   "cite_faster": "",

services/web/locales/en.json

@@ -376,6 +376,7 @@
   "choose_which_experiments": "Choose which experiments you’d like to try.",
   "choose_your_plan": "Choose your plan",
   "citation": "Citation",
+  "citation_key_helper": "Unique key for citations, no spaces or special characters",
   "cite_a_reference_from_your_reference_manager_to_automatically_add_it_to_your_bib_file": "Cite a reference from your reference manager to automatically add it to your .bib file.",
   "cite_directly_or_import_references": "Cite directly or import references",
   "cite_faster": "Cite faster",