* Make font of unread items bolder for better conrttrast - fixes #8599

* Update sidebar-item.css

Role and bot tags are too prominent. When conversations involve lots of sequential messages from bots or users with role tags, the tags make it hard on the eye to track down the message stream. The end effect is a messy view and high cognitive load.

I removed the bot tag from sequential messages entirely and reduced the visual impact of all role tags.

Includes:
- Visual enhancement for less busy tags
- Consolidated styles for role tags
- Use color classes in markup instead of css

Example shows a conversation I'm having with our new buddy Faldo...

Before:
<img width="561" alt="screenshot 2018-08-04 14 52 59" src="https://user-images.githubusercontent.com/1774379/43673494-4ebb4392-9807-11e8-9bc1-ddfc8965569b.png">

After:
<img width="569" alt="screenshot 2018-08-04 16 44 41" src="https://user-images.githubusercontent.com/1774379/43673499-635d75b8-9807-11e8-877d-4a55c723f2bb.png">

#11663 
Compares day, month and year to show the correct create date of channels and users.

Fix #11663 

Adding `timeAgo` function to a `helpers` file so we can test it because just importing it from the previous file will cause an error `Template is not defined`. I reproduced the mentioned case on a test.

Render pretext as markdown when mrkdown_in contains "pretext"
Closes #3828

![image](https://user-images.githubusercontent.com/41751617/43274277-c5de8e30-90cc-11e8-8ba5-a57ad4af2571.png)

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should close #10583

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[FIX] Message attachments was not respecting sort and lost spacing

* Fix default server language not being applied

* Always set user's language on localStorage

[FIX] Broken logo on setup wizard

* Fix regression

* Also update lastMessage

* code style fix

The login screen logo was not centering when displaying on a very small screen width (e.g. mobile device screens).

**Before:** 
![screen shot 2018-07-31 at 12 57 29 pm](https://user-images.githubusercontent.com/6295044/43474669-8269ccfc-94c1-11e8-9546-9d06d51c81a4.png)

**After:**
![screen shot 2018-07-31 at 12 57 18 pm](https://user-images.githubusercontent.com/6295044/43474681-8876e544-94c1-11e8-888e-65c14d614b3a.png)

* Fix stuck push notifications on db failure

* Change push send interval to 5s

Split the saveUser method into two, to reduce complexity

Merge master into develop & Set version to 0.69.0-develop

Release 0.68.0