Real plurals: the web's sync messages and Android's tag counts

Web: one counted(n, one, other) helper. The sync screen's three "(s)"
messages (attachments that didn't download, changes refused, files that
didn't upload) now say "1 file" / "2 files". The six hand-written ternaries
(SyncView x2, ImportNotes, GroupList, ShareDialog, LabelsModal) use it too.

Android: tags_count was two strings chosen in code, and is now <plurals>.
The delete confirmation read "It is on 1 notes … removed from all of them"
and now has a one form of its own.

Operator decision on #5371, 2026-10-08.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

android/app/src/main/res/values/strings.xml

@@ -137,8 +137,10 @@
     <string name="tags_back">Back</string>
     <string name="tags_new_hint">New tag</string>
     <string name="tags_create">Create</string>
-    <string name="tags_count">%1$d notes</string>
-    <string name="tags_count_one">1 note</string>
+    <plurals name="tags_count">
+        <item quantity="one">%d note</item>
+        <item quantity="other">%d notes</item>
+    </plurals>
     <string name="tags_count_none">No notes yet</string>
     <string name="tags_empty_title">No tags yet</string>
     <string name="tags_empty_body">Create one above, or write a #tag in a note and it becomes one.</string>
@@ -166,7 +168,10 @@
     <string name="tags_delete">Delete</string>
     <string name="tags_delete_title">Delete %1$s?</string>
     <string name="tags_delete_body">It will be removed from every note that has it, on every device you sync with. The notes themselves are kept.</string>
-    <string name="tags_delete_body_counted">It is on %1$d notes. It will be removed from all of them, on every device you sync with. The notes themselves are kept.</string>
+    <plurals name="tags_delete_body_counted">
+        <item quantity="one">It is on %d note. It will be removed from it, on every device you sync with. The note itself is kept.</item>
+        <item quantity="other">It is on %d notes. It will be removed from all of them, on every device you sync with. The notes themselves are kept.</item>
+    </plurals>
     <string name="tags_delete_confirm">Delete</string>
     <!-- A tag written as #tag in a note's body is owned by that text. Deleting the
          row cannot un-write the word, so it comes back on that note's next edit —