Remove duplicate language strings

[Rebecca Blundell]

There are quite a few instances where the same language string is repeated in different files.
The duplicates should be removed.

[Kristina Hoeppner (kris-hoeppner)]

This needs to be case sensitive as the case does matter at times.

[Mahara Bot (dev-mahara)]

Patch for "master" branch: https://reviews.mahara.org/8418

[Mahara Bot (dev-mahara)]

Patch for "master" branch: https://reviews.mahara.org/9902

[Cecilia Vela Gurovic (ceciliavg)]

By changing a bit the script find_lang_stgs.sh on one of the patches, I got a file with all language strings, no file path or line, just the language strings. I filtered that to get only the strings that were repeated 3 or more times. For this I used the command
awk '{a[$0]++}END{for(i in a){if(a[i] > 2){print a[i] i}}}' sorted_strings.txt

This are the strings we could check for now
RESULT:
3 Portfolio
3 Friends
4 Instructions
11 Description
3 Between 1 and 100
5 Date
8 None
4 Close
4 Type
4 Note
3 Share
3 WWW root
5 Inbox
3 Attachment
3 No
3 Use the format %s
4 Last modified
4 Select all
3 Site name
3 Cancel
4 License
3 Message
4 Collections
3 Bottom
3 Expires
5 Language
3 Objectionable content
4 Publish
3 Peer assessment
3 Update
7 Created
3 Size
3 Tag
4 Image
3 at
5 Details
3 by
3 Legal consent
3 Application
5 Subject
3 Yes
4 Settings
8 Search
3 Save
5 Public
3 in
3 Last updated
3 Top
3 Tags
4 Members
4 We auto-create accounts
4 Short name
3 Send message
6 Owner
3 Theme
4 Résumé
3 User
3 Template
7 A default title will be generated if you leave the title field blank.
5 Files
3 Reason
4 Folder
9 Name
3 Items to show
4 Are you sure you want to do this? It cannot be undone.
3 Download
3 Height
3 Show
3 Back
4 Group administrators
4 Delete
4 General
3 Admin
5 Institutions
4 About
4 Journal
3 Annotation
7 People
3 Logo
3 Administrators
3 Media
3 Collection
3 Entries imported from a Leap2A export that were not able to be imported elsewhere
7 Institution
10 Title
7 Pages
3 Delete account
4 Open
3 Protocol
4 Password
3 URL
4 Reply
7 Add
4 Advanced
3 Fonts
4 Import
3 Page
4 Preview
4 Continue
3 Manage
4 Block content
5 Group
3 Masquerading sessions
3 My groups
8 Groups
3 Create
6 All
3 Email disabled
4 Plans
3 Profile
4 Journal entry
3 Entries per page
3 REST
4 Width
5 Edit
3 Comments
4 Comment
3 Person
4 Display name
4 Social media
4 Artefacts
3 Start date
4 Content
5 Text
3 Untitled
5 Status
5 Remove