docs(guide/ru,uk): rename files due to en version

Rename files due to English version of the guide.
docs(guide/ru,uk): Language negotiation

Add language negotiation chapter to the Ukrainian and Russian versions of the Guide.
docs(guide/ru,uk): Fallback languages

Add fallback languages chapter to the Ukrainian and Russian versions of the Guide.
docs(guide/ru,uk): Post compiling

Add a chapter about Post compiling to the Ukrainian and Russian versions of the Guide.
docs(guide/tu, uk): Tools

Add a chapter about tools to the Ukrainian and Russian versions of the Guide.
Merge pull request #360 from DWand/russian-ukrainian-guide-translation

Update Ukrainian and Russian versions of the Guide