Hard-code the `MOZCENTRAL` build to use the `[other]` plural forms of the matcheCount strings, to prevent errors for PDF files embedded in iframe/object tags
Hard-code the `MOZCENTRAL` build to use the `[other]` plural forms of the matcheCount strings, to prevent errors for PDF files embedded in iframe/object tags

The built-in PDF Viewer (in Firefox) cannot use the browser findbar when PDF files are embedded in e.g. iframe/object tags, and the PDF.js findbar (i.e. `PDFFindBar`) will thus be used instead in those cases.
This is slightly problematic, since the `MOZCENTRAL` version of the viewer uses a special, slimmed down, version of the `l10n.js` file that doesn't (currently) support plural forms. To prevent the matchesCounter from breaking completely in this edge-case, temporarily hard-code the plural form to use the default `[other]` version of the locale strings.

nawawi/pdf.js,Shoobx/pdf.js,mainegreen/pdf.js,timvandermeij/pdf.js,macroplant/pdf.js,Snuffleupagus/pdf.js,mozilla/pdf.js,mainegreen/pdf.js,mozilla/pdf.js,timvandermeij/pdf.js,timvandermeij/pdf.js,Snuffleupagus/pdf.js,macroplant/pdf.js,showpad/mozilla-pdf.js,mukulmishra18/pdf.js,nawawi/pdf.js,xavier114fch/pdf.js,mukulmishra18/pdf.js,Shoobx/pdf.js,showpad/mozilla-pdf.js,Shoobx/pdf.js,macroplant/pdf.js,caremerge/pdf.js,xavier114fch/pdf.js,showpad/mozilla-pdf.js,Snuffleupagus/pdf.js,mozilla/pdf.js,caremerge/pdf.js,nawawi/pdf.js