fix(i18n): Translate the remaining Git and pull request text (#116)

Multi-repo branch popup matches actions by their translated label (highlights and Chinese search now work) and translates its group headers. Conflict counts, relative times (shared dateFormat), in-progress operation titles, git operation progress/results, branch widget tooltips, diff/hunk counts, worktree markers, PR author line and review placeholders go through tx; the default "Changes" changelist shows its translated name. HexViewer read-only leaves the untranslated allowlist. 92 zh entries.

Claude-Session: https://claude.ai/code/session_01VUYsdXA2nkF5v6zsC93dpn

src/features/database/ObjectDialogs.tsx

@@ -293,7 +293,7 @@ function ModifyTableDialog(props: ModifyProps) {
       width={440}
       buttons={[{ label: "Cancel", role: "cancel" }]}
     >
-      <div className={styles.dialogText}>{details?.status === "error" ? details.message : "Loading…"}</div>
+      <div className={styles.dialogText}>{details?.status === "error" ? details.message : tx("Loading…")}</div>
     </Dialog>
   );
 }