[NHentai] Fix language filter (#4642)

* [NHentai] Fix language filter

* Update build.gradle

src/all/nhentai/build.gradle

@@ -1,7 +1,7 @@
 ext {
     extName = 'NHentai'
     extClass = '.NHFactory'
-    extVersionCode = 42
+    extVersionCode = 43
     isNsfw = true
 }
 

src/all/nhentai/src/eu/kanade/tachiyomi/extension/all/nhentai/NHentai.kt

@@ -138,7 +138,7 @@ open class NHentai(
     override fun searchMangaRequest(page: Int, query: String, filters: FilterList): Request {
         val fixedQuery = query.ifEmpty { "\"\"" }
         val filterList = if (filters.isEmpty()) getFilterList() else filters
-        val nhLangSearch = if (nhLang.isBlank()) "" else "+$nhLang "
+        val nhLangSearch = if (nhLang.isBlank()) "" else "+language:$nhLang "
         val advQuery = combineQuery(filterList)
         val favoriteFilter = filterList.findInstance<FavoriteFilter>()
         val isOkayToSort = filterList.findInstance<UploadedFilter>()?.state?.isBlank() ?: true