fix(i18n): Translate the remaining UI text (Git, hierarchy, pull requests, dialogs, aria labels) (#114)

Hard-coded UI text, titles and aria-labels in about 110 components (Git panels, hierarchy, pull requests, dialogs, settings, welcome) now go through tx; spliced fragments became whole sentences (fileCount, noneFoundLabel, hierarchyTitle) and pull request states use keyed messages. 225 zh entries added, stale fragment entries removed.

Also: tx used as a tag without interpolations (tx`No checks`) now looks the text up exactly instead of as a template, so it is translated like tx("No checks"); the text-catalog test checks such tags as plain literals. Check and test counts reuse the existing "{count} passed" / "{failed} failing" entries.

Claude-Session: https://claude.ai/code/session_01VUYsdXA2nkF5v6zsC93dpn
Co-authored-by: jaw52 <[email protected]>

src/features/vcs/commitChecks.tsx

@@ -180,10 +180,6 @@ export interface CommitProblem {
   details?: { label: string; run: () => void };
 }
 
-function plural(n: number, word: string) {
-  return `${n} ${word}${n === 1 ? "" : "s"}`;
-}
-
 // ---------------------------------------------------------------------------
 
 export interface CommitCandidate {
@@ -289,7 +285,11 @@ export async function runCommitChecks(files: readonly CommitCandidate[], amend:
         title: "TODO",
         text: (
           <>
-            <div>{plural(hits.length, "TODO item")} found in the changed lines:</div>
+            <div>
+              {hits.length === 1
+                ? tx`${hits.length} TODO item found in the changed lines:`
+                : tx`${hits.length} TODO items found in the changed lines:`}
+            </div>
             <ul className={styles.todoList}>
               {hits.slice(0, 20).map((h, i) => (
                 <li key={i}>
@@ -325,13 +325,14 @@ export async function runCommitChecks(files: readonly CommitCandidate[], amend:
         }
       }
       if (crlf.length) {
+        const crlfNames = crlf.slice(0, 5).map(baseName).join(", ") + (crlf.length > 5 ? ", …" : "");
         problems.push({
           title: "Line separators",
           text: (
             <>
-              {plural(crlf.length, "file")} ({crlf.slice(0, 5).map(baseName).join(", ")}
-              {crlf.length > 5 ? ", …" : ""}) contain CRLF line separators and core.autocrlf is not set, so they would be
-              committed with CRLF. Convert them with the line separator widget in the status bar, or set{" "}
+              {crlf.length === 1
+                ? tx`${crlf.length} file (${crlfNames}) contain CRLF line separators and core.autocrlf is not set, so they would be committed with CRLF. Convert them with the line separator widget in the status bar, or set`
+                : tx`${crlf.length} files (${crlfNames}) contain CRLF line separators and core.autocrlf is not set, so they would be committed with CRLF. Convert them with the line separator widget in the status bar, or set`}{" "}
               <code>git config core.autocrlf input</code>.
             </>
           ),