[ticket/10325] add allow forgot password option in acp

PHPBB3-10325
[ticket/10325] trigger error if forgot password option disabled

PHPBB3-10325
[ticket/10325] add new config value to database

PHPBB3-10325
[ticket/10325] fix language

PHPBB3-10325
[ticket/10325] change language var

PHPBB3-10325
[ticket/10325] fix language variable

PHPBB3-10325
[ticket/10325] fix language key

PHPBB3-10325
[ticket/10325] improve acp option language

PHPBB3-10325
[ticket/10325] fix language in acp and ucp

PHPBB3-10325
[ticket/10325] add logout function in functional_test_case

PHPBB3-10325
[ticket/10325] functional tests for forgot password functionality

PHPBB3-10325
[ticket/10325] add assert_response_success in test

PHPBB3-10325
[ticket/10325] fix language in acp and ucp

PHPBB3-10325
[ticket/10325] use assert_response_success parts

PHPBB3-10325
[ticket/10325] fix acp language

PHPBB3-10325
[ticket/10325] move migration into a new file

PHPBB3-10325
Merge PR #1209 branch 'dhruvgoel92/ticket/10325' into develop

# By Dhruv
# Via Dhruv
* dhruvgoel92/ticket/10325:
  [ticket/10325] move migration into a new file
  [ticket/10325] fix acp language
  [ticket/10325] use assert_response_success parts
  [ticket/10325] fix language in acp and ucp
  [ticket/10325] add assert_response_success in test
  [ticket/10325] functional tests for forgot password functionality
  [ticket/10325] add logout function in functional_test_case
  [ticket/10325] fix language in acp and ucp
  [ticket/10325] improve acp option language
  [ticket/10325] fix language key
  [ticket/10325] fix language variable
  [ticket/10325] change language var
  [ticket/10325] fix language
  [ticket/10325] add new config value to database
  [ticket/10325] trigger error if forgot password option disabled
  [ticket/10325] add allow forgot password option in acp