When uploading an avatar keep "Select file" button

Improment/integrations

Force file names to always be in LTR

Add some missing vlaues

Currently when you upload an image as an avatar, the "SELECT FILE" button disappears and you get another button to use the uploaded file. However, if you didn't like how the uploaded image looks you cannot upload another one. The work around is to reopen the avatar settings page, instead the upload button should stay there to allow the user to upload a different image.

In RTL interface if the file name  has only number, or included RTL characters the file extension will be shown in the wrong side. This fix makes file extensions show correctly for all files

Added UTF8_Names_Validation and UTF8_Names_Slugify

# By matthewmawby (2) and others
# Via Gabriel Engel (2) and others
* 'develop' of github.com:RocketChat/Rocket.Chat:
  fixes blockquote non-continous border - closes #1605
  Removed trash can icon
  tabbed added code
  Added the code to fix issue #1579
  Added in functionality recommended in issue #1412

Added the code to fix issue #1579

Removed trash can icon

Removed the trash icon since the buttons are used to upload files and not delete them