[ticket/12680] Adds alternative text to contact icon in viewtopic.php

PHPBB3-12680
[ticket/12680] Adds second alternativ text and font-size: 0 to remove text

PHPBB3-12680
[ticket/12680] Adds alternativ text with new variable to contact:

PHPBB3-12680
[ticket/12680] Removes unnessesary $user->lang from CONTACT_USER

PHPBB3-12680
[ticket/12680] Little changes, but some issues are still there

PHPBB3-12680
[ticket/12680] Still some problems with displaying the nickname in ucp

PHPBB3-12680
[ticket/12755] Add timeout to remote upload to prevent infinite loop

PHPBB3-12755
[ticket/12680] Solves last bugs. viewprofile: contact --> contact nickname

PHPBB3-12680
[ticket/12680] Brings back get_username_string()

PHPBB3-12680
[ticket/12755] Add language string for timed out remote upload

PHPBB3-12755
[ticket/12680] Adds variable for guest user

PHPBB3-12680
[ticket/12755] Change upload in remote_upload() method to fit get_remote_file

PHPBB3-12755
[ticket/12755] Terminate upload loop if upload reaches filesize

Terminate the upload loop if the expected filesize has been reached instead
of trying to read more bytes until the timeout has been reached.

PHPBB3-12755
[ticket/12755] Apply de morgan to conditional

PHPBB3-12755
[ticket/12562] Revert "Add max-width to proSilver"

https://tracker.phpbb.com/browse/PHPBB3-12562

PHPBB3-12562
Merge pull request #2633 from marc1706/ticket/12755

[ticket/12755] Add timeout to remote upload to prevent infinite loop

* marc1706/ticket/12755:
  [ticket/12755] Apply de morgan to conditional
  [ticket/12755] Terminate upload loop if upload reaches filesize
  [ticket/12755] Change upload in remote_upload() method to fit get_remote_file
  [ticket/12755] Add language string for timed out remote upload
  [ticket/12755] Add timeout to remote upload to prevent infinite loop
Merge branch 'develop-olympus' into develop-ascraeus

* develop-olympus:
  [ticket/12755] Apply de morgan to conditional
  [ticket/12755] Terminate upload loop if upload reaches filesize
  [ticket/12755] Change upload in remote_upload() method to fit get_remote_file
  [ticket/12755] Add language string for timed out remote upload
  [ticket/12755] Add timeout to remote upload to prevent infinite loop
Merge pull request #2648 from dhruvgoel92/ticket/12562

Revert "[ticket/12562] Add max-width to proSilver"

* dhruvgoel92/ticket/12562:
  [ticket/12562] Revert "Add max-width to proSilver"
[prep-release-3.1.0-RC1] Update version to 3.1.0-RC1
[prep-release-3.1.0-RC1] Add migration for 3.1.0-RC1