i18n: use ellipsis character (#7154)

- Instead of using `...`, use the unicode character for ellipsis `…`.
- According to weblate: Using the Unicode character is in most cases the better approach and looks better rendered, and may sound better with text-to-speech.

Reviewed-on: https://codeberg.org/forgejo/forgejo/pulls/7154
Reviewed-by: 0ko <0ko@noreply.codeberg.org>
Reviewed-by: Otto <otto@codeberg.org>
Co-authored-by: Gusted <postmaster@gusted.xyz>
Co-committed-by: Gusted <postmaster@gusted.xyz>

tests/integration/pull_test.go

@@ -27,7 +27,7 @@ func TestViewPulls(t *testing.T) {
 	htmlDoc := NewHTMLParser(t, resp.Body)
 	search := htmlDoc.doc.Find(".list-header-search > .search > .input > input")
 	placeholder, _ := search.Attr("placeholder")
-	assert.Equal(t, "Search pulls...", placeholder)
+	assert.Equal(t, "Search pulls…", placeholder)
 }
 
 func TestPullManuallyMergeWarning(t *testing.T) {