ReCaptcha feature
ReCaptcha config from setup script

Added config setting to be available from the ./setup script. Captcha
public and private keys are added in the Features->Security tab, the
captchaLogin is available in the New Server tab where you can enable or
disable reCaptcha for that server.
ReCaptcha https and CSP bug fixes
ReCaptcha error message
Recaptcha bug fixes

Error message for empty captcha "Please enter correct captcha!" and if
the user enters correct captcha but wrong login data it won't be
required to enter it next time.
refactor server_binlog.php:
1. split to functions
2. move function to server_bin_log.lib.php
fix code indention
split navigation and item render from long function
Fix comment
Remove not used function
Document functions
Translated using Weblate (Bulgarian)

Currently translated at 73.1% (1949 of 2665)
Merge remote-tracking branch 'origin/master'
Merge pull request #404 from xmujay/0604_server_status_monitor

refactor server_binlog.php:1. split to functions 2. move function to server_bin_log.lib.php
refactor server_plugins.php:
1. change HTML mixture to php
2. change long code to functions
3. move functions to libraries/server_plugins.lib.php
fix code indention
using space instead of Tab
move PMA_getSubPageHeader to server_common.inc.php
fix the issues:
1. replace tab with space in server_bin_log.lib.php
2. move $bin_log to server_binlog.php
3. add server common function file server_common.lib.php
Merge pull request #405 from xmujay/0604_server_plugins

refactor server_plugins.php: