feat: 优化

app/src/main/java/io/legado/app/ui/about/AboutActivity.kt

@@ -26,9 +26,10 @@ class AboutActivity : BaseActivity(R.layout.activity_about) {
         tv_app_summary.post {
             val span = ForegroundColorSpan(accentColor)
             val spannableString = SpannableString(tv_app_summary.text)
-            val start = spannableString.indexOf(getString(R.string.legado_gzh))
+            val gzh = getString(R.string.legado_gzh)
+            val start = spannableString.indexOf(gzh)
             spannableString.setSpan(
-                span, start, start + 6,
+                span, start, start + gzh.length,
                 Spannable.SPAN_EXCLUSIVE_EXCLUSIVE
             )
             tv_app_summary.text = spannableString