Crowdin: store language code as part of filename

Add language tag to the filename of locally downloaded Crowdin files for
use when the file format doesn't contain project etc. metadata.

This fixes issue similar to vslavik#792 when handling native XLIFF files, which
unlike Crowdin-converted XLIFF files may also contain zh-Hans/Hant as
the language rather than zh-CN/TW expected by Crowdin API.

See vslavik#792.

src/crowdin_gui.cpp

@@ -695,8 +695,9 @@ class CrowdinOpenDialog : public wxDialog
         std::replace_if(fileName.begin(), fileName.end(), boost::is_any_of("\\/:\"<>|?*"), '_');
         std::replace_if(projectName.begin(), projectName.end(), boost::is_any_of("\\/:\"<>|?*"), '_');
 
+        // NB: sync this with ExtractCrowdinMetadata()
         const wxString dir = GetCrowdinCacheDir() + projectName + " - " + lang.Code();
-        wxFileName localFileName(dir + "/Crowdin." << projectId << '.' << fileId << ' ' << fileName);
+        wxFileName localFileName(dir + wxString::Format("/Crowdin.%d.%d.%s %s", projectId, fileId, lang.LanguageTag(), fileName));
 
         auto ext = localFileName.GetExt().Lower();
         if (ext == "po")
@@ -744,12 +745,19 @@ bool ExtractCrowdinMetadata(CatalogPtr cat,
                             std::string *xliffRemoteFilename = nullptr)
 {
     auto& hdr = cat->Header();
+    bool crowdinSpecificLangUsed = false;
 
     if (lang)
     {
-        *lang = hdr.HasHeader("X-Crowdin-Language")
-                ? Language::FromLanguageTag(hdr.GetHeader("X-Crowdin-Language").ToStdString())
-                : cat->GetLanguage();
+        if (hdr.HasHeader("X-Crowdin-Language"))
+        {
+            *lang = Language::FromLanguageTag(hdr.GetHeader("X-Crowdin-Language").ToStdString());
+            crowdinSpecificLangUsed = true;
+        }
+        else
+        {
+            *lang = cat->GetLanguage();
+        }
     }
 
     const auto xliff = std::dynamic_pointer_cast<XLIFFCatalog>(cat);
@@ -783,7 +791,8 @@ bool ExtractCrowdinMetadata(CatalogPtr cat,
         return true;
     }
 
-    static const std::wregex RE_CROWDIN_FILE(L"^Crowdin\\.([0-9]+)\\.([0-9]+) .*");
+    // NB: sync this with CreateLocalFilename()
+    static const std::wregex RE_CROWDIN_FILE(L"^Crowdin\\.([0-9]+)\\.([0-9]+)(\\.([a-zA-Z-]+))? .*");
     auto name = wxFileName(cat->GetFileName()).GetName().ToStdWstring();
 
     std::wsmatch m;
@@ -793,6 +802,8 @@ bool ExtractCrowdinMetadata(CatalogPtr cat,
             *projectId = std::stoi(m.str(1));
         if (fileId)
             *fileId = std::stoi(m.str(2));
+        if (lang && !crowdinSpecificLangUsed && m[4].matched)
+            *lang = Language::FromLanguageTag(str::to_utf8(m[4].str()));
         return true;
     }