Add lang + ref tags to frontmatter

Those are fields used by the language switcher to correlate pages across
different languages, even if they have different names/paths/titles.
They are generated with the prepare_for_translation.py script.

user/advanced-configuration/awesome.md

@@ -1,8 +1,10 @@
 ---
+lang: en
 layout: doc
 permalink: /doc/awesome/
 redirect_from:
 - /en/doc/awesome/
+ref: 179
 title: awesome
 ---
 

user/advanced-configuration/bind-dirs.md

@@ -1,8 +1,10 @@
 ---
+lang: en
 layout: doc
 permalink: /doc/bind-dirs/
 redirect_from:
 - /en/doc/bind-dirs/
+ref: 186
 title: How to make any file in a TemplateBasedVM persistent using bind-dirs
 ---
 

user/advanced-configuration/config-files.md

@@ -1,4 +1,5 @@
 ---
+lang: en
 layout: doc
 permalink: /doc/config-files/
 redirect_from:
@@ -6,6 +7,7 @@ redirect_from:
 - /doc/ConfigFiles/
 - /doc/UserDoc/ConfigFiles/
 - /wiki/UserDoc/ConfigFiles/
+ref: 180
 title: Config Files
 ---
 

user/advanced-configuration/disposablevm-customization.md

@@ -1,4 +1,5 @@
 ---
+lang: en
 layout: doc
 permalink: /doc/disposablevm-customization/
 redirect_from:
@@ -7,6 +8,7 @@ redirect_from:
 - /doc/DispVMCustomization/
 - /doc/UserDoc/DispVMCustomization/
 - /wiki/UserDoc/DispVMCustomization/
+ref: 174
 title: DisposableVM Customization
 ---
 

user/advanced-configuration/gui-configuration.md

@@ -1,7 +1,9 @@
 ---
+lang: en
 layout: doc
 permalink: /doc/gui-configuration/
 redirect_from: []
+ref: 184
 title: GUI Configuration
 ---
 

user/advanced-configuration/i3.md

@@ -1,10 +1,12 @@
 ---
+lang: en
 layout: doc
 permalink: /doc/i3/
 redirect_from:
 - /en/doc/i3/
 - /doc/UserDoc/i3/
 - /wiki/UserDoc/i3/
+ref: 183
 title: i3
 ---
 

user/advanced-configuration/installing-contributed-packages.md

@@ -1,6 +1,8 @@
 ---
+lang: en
 layout: doc
 permalink: /doc/installing-contributed-packages/
+ref: 225
 title: Installing contributed packages
 ---
 

user/advanced-configuration/kde.md

@@ -1,7 +1,9 @@
 ---
+lang: en
 layout: doc
 permalink: /doc/kde/
 redirect_from: /en/doc/kde/
+ref: 176
 title: KDE
 ---
 

user/advanced-configuration/managing-vm-kernel.md

@@ -1,8 +1,10 @@
 ---
+lang: en
 layout: doc
 permalink: /doc/managing-vm-kernel/
 redirect_from:
 - /en/doc/managing-vm-kernel/
+ref: 173
 title: Managing VM kernel
 ---
 

user/advanced-configuration/mount-from-other-os.md

@@ -1,10 +1,12 @@
 ---
+lang: en
 layout: doc
 permalink: /doc/mount-from-other-os/
 redirect_from:
 - /en/doc/mount-from-other-os/
 - /doc/MountFromOtherOs/
 - /wiki/MountFromOtherOs/
+ref: 175
 title: Mounting and Decrypting Qubes Partitions from Outside Qubes
 ---
 

user/advanced-configuration/resize-disk-image.md

@@ -1,4 +1,5 @@
 ---
+lang: en
 layout: doc
 permalink: /doc/resize-disk-image/
 redirect_from:
@@ -8,6 +9,7 @@ redirect_from:
 - /doc/ResizeRootDiskImage/
 - /wiki/ResizeDiskImage/
 - /wiki/ResizeRootDiskImage/
+ref: 182
 title: Resize Disk Image
 ---
 

user/advanced-configuration/rpc-policy.md

@@ -1,6 +1,8 @@
 ---
+lang: en
 layout: doc
 permalink: /doc/rpc-policy/
+ref: 178
 title: RPC Policies
 ---
 

user/advanced-configuration/salt.md

@@ -1,6 +1,8 @@
 ---
+lang: en
 layout: doc
 permalink: /doc/salt/
+ref: 185
 title: Management stack
 ---
 

user/advanced-configuration/secondary-storage.md

@@ -1,10 +1,12 @@
 ---
+lang: en
 layout: doc
 permalink: /doc/secondary-storage/
 redirect_from:
 - /en/doc/secondary-storage/
 - /doc/SecondaryStorage/
 - /wiki/SecondaryStorage/
+ref: 187
 title: Secondary Storage
 ---
 

user/advanced-configuration/usb-qubes.md

@@ -1,4 +1,5 @@
 ---
+lang: en
 layout: doc
 permalink: /doc/usb-qubes/
 redirect_from:
@@ -7,6 +8,7 @@ redirect_from:
 - /doc/USBVM/
 - /wiki/USBVM/
 - /doc/sys-usb/
+ref: 181
 title: USB Qubes
 ---