fix(i18n): name commits in Korean in the compare-summary tooltip

The Korean pair for the "commits ahead" tooltip was copied from
compareBaseCommitsAheadOne/Other, which keep the English "commit" and
"commits". Both sentences now say 커밋 with the 개 counter, the form
#27907 uses for its Korean count sentences, so the tooltip no longer
carries an English plural.

The locale test also requires ja, ko and zh to use one sentence for
both counts. It fails on the previous Korean pair.

src/renderer/src/i18n/count-sentence-locales.test.ts

@@ -58,4 +58,16 @@ describe('count sentences in the bundled locales', () => {
       expect(renderCountSentence(baseKey, 3, values), baseKey).not.toMatch(LATIN_S_AFTER_CJK)
     }
   })
+
+  // Why: these languages do not inflect for number, so a pair that differs carries an
+  // English plural inside the sentence ("commit"/"commits").
+  it.each(['ja', 'ko', 'zh'])('%s uses one sentence for one and several', async (locale) => {
+    await i18n.changeLanguage(locale)
+    for (const [baseKey, values] of COUNT_SENTENCES) {
+      const options = { ...values, count: 3, defaultValue: '' }
+      expect(i18n.t(`${baseKey}Plural`, options), baseKey).toBe(
+        i18n.t(`${baseKey}Singular`, options)
+      )
+    }
+  })
 })

src/renderer/src/i18n/locales/ko.json

@@ -13492,8 +13492,8 @@
               "compare": {
                 "summary": {
                   "dd72a6fd37": "{{value0}}은 {{value2}}보다 먼저 {{value1}}을 커밋합니다.",
-                  "commitsAheadSingular": "{{ref}}보다 {{count}} commit 앞서 있음",
-                  "commitsAheadPlural": "{{ref}}보다 {{count}} commits 앞서 있음"
+                  "commitsAheadSingular": "{{ref}}보다 커밋 {{count}}개 앞서 있음",
+                  "commitsAheadPlural": "{{ref}}보다 커밋 {{count}}개 앞서 있음"
                 }
               },
               "conflict": {