VOLDEV-36: Recent changes filter and Forum quotes use incorrect style from Theme Designer in Monobook

These changes address several colorization issues when using Forum and the Recent Changes filter dropdown in the Monobook skin; by default, the Oasis colorization conflicts with the color scheme of vanilla, uncustomized Monobook.
@Grunny @michalroszka 
Issue [VOLDEV-36](https://wikia-inc.atlassian.net/browse/VOLDEV-36).