fix php template
labels in submit buttons + new screenshot
feature #4096 labels in submit buttons + new screenshot (ricardclau)

This PR was merged into the 2.3 branch.

Discussion
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labels in submit buttons + new screenshot

| Q             | A
| ------------- | ---
| Doc fix?      | yes
| New docs?     | no
| Applies to    | 2.3+
| Fixed tickets | #3983

As per @weaverryan suggestion in #3983 discussion

PR is made against 2.3 branch since this is when submit buttons were added

Commits
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261f6b2 labels in submit buttons + new screenshot
bug #4095 Fix php template (piotrantosik)

This PR was merged into the 2.3 branch.

Discussion
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Fix php template

| Q             | A
| ------------- | ---
| Doc fix?      | yes
| New docs?     | no
| Applies to    | 2.3+
| Fixed tickets | no

Commits
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18d71b1 fix php template
Adding a new entry about reverse proxies in the framework and linking to it in many places
Adding another note about how AppCache is a reverse proxy at the IP address 127.0.0.1
Fixing build error
[Cookbook][Forms] fix PHP template file name
A bunch of changes thanks to @xabbuh and @stof
bug #4103 [Cookbook][Forms] fix PHP template file name (xabbuh)

This PR was merged into the 2.3 branch.

Discussion
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[Cookbook][Forms] fix PHP template file name

| Q             | A
| ------------- | ---
| Doc fix?      | yes
| New docs?     | no
| Applies to    | all
| Fixed tickets | part of #4088

Commits
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6a14650 [Cookbook][Forms] fix PHP template file name
Title case fix thanks to @xabbuh!
feature #4102 Adding a new entry about reverse proxies in the framework (weaverryan)

This PR was merged into the 2.3 branch.

Discussion
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Adding a new entry about reverse proxies in the framework

Hi guys!

| Q             | A
| ------------- | ---
| Doc fix?      | no
| New docs?     | no
| Applies to    | all (or 2.3+)
| Fixed tickets | #2946 #2491

Per #2491, I wanted to answer the simple question: "What do I need to do in order to configure Symfony if I have a reverse proxy". The `trusted_proxies` is already documented in the reference section, but this is a full walk-through of what you should be doing and why. I've also increased links in several places where notes are needed.

Thanks!

Commits
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5ab6c4a Title case fix thanks to @xabbuh!
89e4d9d A bunch of changes thanks to @xabbuh and @stof
81053ab Fixing build error
c55bc2e Adding another note about how AppCache is a reverse proxy at the IP address 127.0.0.1
18af4e8 Adding a new entry about reverse proxies in the framework and linking to it in many places
Fixing bulleting on reverse proxy thanks to @xabbuh
Merge branch '2.3' into 2.4

* 2.3:
  Fixing bulleting on reverse proxy thanks to @xabbuh
  Title case fix thanks to @xabbuh!
  A bunch of changes thanks to @xabbuh and @stof
  [Cookbook][Forms] fix PHP template file name
  Fixing build error
  Adding another note about how AppCache is a reverse proxy at the IP address 127.0.0.1
  Adding a new entry about reverse proxies in the framework and linking to it in many places
  labels in submit buttons + new screenshot
  fix php template