Text: Use arx_base.ttf

This is new in AF 1.22 and is the same as arx_russian.ttf included
in 1.21.

arx_base.ttf has cyrillic glypths in positions where they should not
be which breaks things for French so only use it as a fallback.

For the Russian version, arx_russian.ttf is preferred anyway.

src/gui/Text.cpp

@@ -298,6 +298,11 @@ static bool getFontFile(res::path & result) {
 		return true;
 	}
 
+	result = "misc/arx_base.ttf";
+	if(g_resources->hasFile(result)) {
+		return true;
+	}
+
 	if(!config.language.empty()) {
 		LogCritical << "Missing font file: need either misc/arx_" << config.language
 		            << ".ttf, misc/arx_default.ttf or misc/arx.ttf.";