refactor(core): minor tweaks

Author: meteorlxy

packages/@vuepress/core/src/page/resolvePageDate.ts

@@ -52,7 +52,7 @@ export const resolvePageDate = ({
 
   const dirname = path.dirname(filePathRelative)
 
-  if (dirname) {
+  if (dirname !== '.') {
     const matches = dirname.match(DIRNAME_DATE_RE)
     if (matches) {
       return formatDateString(

packages/@vuepress/core/src/page/resolvePageLang.ts

@@ -16,5 +16,5 @@ export const resolvePageLang = ({
   if (isString(frontmatter.lang) && frontmatter.lang) {
     return frontmatter.lang
   }
-  return app.siteData.locales[pathLocale]?.lang ?? app.siteData.lang ?? ''
+  return app.siteData.locales[pathLocale]?.lang ?? app.siteData.lang
 }