Replace spaces with "%20" in "urlPrefix", before markdon processing.
The spaces were causing blackfriday (markdown processor) to behave
strange. This fixes #2545.

When <code> is nested inside <pre>, the next end tag token would not able to be the same
as outer-most start tag. So we only check outer-most start and end tag token to be the same.

- #1904 minor fix on image link

- code format for #1020

HTML tags are no longer processed for special links, etc
Contents of <a>, <code> and <pre> are not processed for special links
Processing for special links is done after Markdown conversion

Fixes #921 and makes the Mention regexp be in line with the others

- modules/base/markdown.go: fix issue link issue
- routers/repo/view.go: remove useless code

- conf/locale: add mew translator profile

- update russian locale

Fix link to user profile, update based on adjusted MentionPattern

Conflicts:
	modules/setting/setting.go

Conflicts:
	templates/repo/release/list.tmpl
	templates/user/dashboard/dashboard.tmpl

Conflicts:
	routers/repo/setting.go