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.

external/configuration-guides/change-time-zone.md

@@ -1,7 +1,9 @@
 ---
+lang: en
 layout: doc
 redirect_from:
 - /doc/change-time-zone/
 redirect_to: https://github.com/Qubes-Community/Contents/blob/master/docs/configuration/change-time-zone.md
+ref: 109
 title: Changing your Time Zone
 ---

external/configuration-guides/disk-trim.md

@@ -1,4 +1,5 @@
 ---
+lang: en
 layout: doc
 redirect_from:
 - /doc/disk-trim/
@@ -6,5 +7,6 @@ redirect_from:
 - /doc/DiskTRIM/
 - /wiki/DiskTRIM/
 redirect_to: https://github.com/Qubes-Community/Contents/blob/master/docs/configuration/disk-trim.md
+ref: 104
 title: Disk TRIM
 ---

external/configuration-guides/external-audio.md

@@ -1,4 +1,5 @@
 ---
+lang: en
 layout: doc
 redirect_from:
 - /doc/external-audio/
@@ -6,5 +7,6 @@ redirect_from:
 - /doc/ExternalAudio/
 - /wiki/ExternalAudio/
 redirect_to: https://github.com/Qubes-Community/Contents/blob/master/docs/configuration/external-audio.md
+ref: 100
 title: External Audio
 ---

external/configuration-guides/fetchmail.md

@@ -1,4 +1,5 @@
 ---
+lang: en
 layout: doc
 redirect_from:
 - /doc/fetchmail/
@@ -6,5 +7,6 @@ redirect_from:
 - /doc/Fetchmail/
 - /wiki/Fetchmail/
 redirect_to: https://github.com/Qubes-Community/Contents/blob/master/docs/configuration/fetchmail.md
+ref: 114
 title: Fetchmail
 ---

external/configuration-guides/install-nvidia-driver.md

@@ -1,4 +1,5 @@
 ---
+lang: en
 layout: doc
 redirect_from:
 - /doc/install-nvidia-driver/
@@ -6,5 +7,6 @@ redirect_from:
 - /doc/InstallNvidiaDriver/
 - /wiki/InstallNvidiaDriver/
 redirect_to: https://github.com/Qubes-Community/Contents/blob/master/docs/configuration/install-nvidia-driver.md
+ref: 96
 title: How to Install an Nvidia Driver
 ---

external/configuration-guides/multiboot.md

@@ -1,7 +1,9 @@
 ---
+lang: en
 layout: doc
 redirect_from:
 - https://github.com/Qubes-Community/Contents/blob/master/docs/configuration/multiboot.md
 redirect_to: https://github.com/Qubes-Community/Contents/blob/master/docs/configuration/multiboot.md
+ref: 112
 title: Multibooting
 ---

external/configuration-guides/multimedia.md

@@ -1,4 +1,5 @@
 ---
+lang: en
 layout: doc
 redirect_from:
 - /doc/multimedia/
@@ -6,5 +7,6 @@ redirect_from:
 - /doc/Multimedia/
 - /wiki/Multimedia/
 redirect_to: https://github.com/Qubes-Community/Contents/blob/master/docs/configuration/multimedia.md
+ref: 105
 title: How to Make a Multimedia TemplateVM
 ---

external/configuration-guides/mutt.md

@@ -1,4 +1,5 @@
 ---
+lang: en
 layout: doc
 redirect_from:
 - /doc/mutt/
@@ -6,5 +7,6 @@ redirect_from:
 - /doc/Mutt/
 - /wiki/Mutt/
 redirect_to: https://github.com/Qubes-Community/Contents/blob/master/docs/configuration/mutt.md
+ref: 106
 title: Mutt
 ---

external/configuration-guides/network-bridge-support.md

@@ -1,4 +1,5 @@
 ---
+lang: en
 layout: doc
 redirect_from:
 - /doc/network-bridge-support/
@@ -6,5 +7,6 @@ redirect_from:
 - /doc/NetworkBridgeSupport/
 - /wiki/NetworkBridgeSupport/
 redirect_to: https://github.com/Qubes-Community/Contents/blob/master/docs/configuration/network-bridge-support.md
+ref: 113
 title: Network Bridge Support
 ---

external/configuration-guides/network-printer.md

@@ -1,4 +1,5 @@
 ---
+lang: en
 layout: doc
 redirect_from:
 - /doc/network-printer/
@@ -6,5 +7,6 @@ redirect_from:
 - /doc/NetworkPrinter/
 - /wiki/NetworkPrinter/
 redirect_to: https://github.com/Qubes-Community/Contents/blob/master/docs/configuration/network-printer.md
+ref: 108
 title: Network Printer
 ---

external/configuration-guides/postfix.md

@@ -1,4 +1,5 @@
 ---
+lang: en
 layout: doc
 redirect_from:
 - /doc/postfix/
@@ -6,5 +7,6 @@ redirect_from:
 - /doc/Postfix/
 - /wiki/Postfix/
 redirect_to: https://github.com/Qubes-Community/Contents/blob/master/docs/configuration/postfix.md
+ref: 107
 title: Postfix
 ---

external/configuration-guides/rxvt.md

@@ -1,4 +1,5 @@
 ---
+lang: en
 layout: doc
 redirect_from:
 - /doc/rxvt/
@@ -6,5 +7,6 @@ redirect_from:
 - /doc/Rxvt/
 - /wiki/Rxvt/
 redirect_to: https://github.com/Qubes-Community/Contents/blob/master/docs/configuration/rxvt.md
+ref: 103
 title: Rxvt
 ---

external/configuration-guides/tips-and-tricks.md

@@ -1,7 +1,9 @@
 ---
+lang: en
 layout: doc
 redirect_from:
 - /doc/tips-and-tricks/
 redirect_to: https://github.com/Qubes-Community/Contents/blob/master/docs/configuration/tips-and-tricks.md
+ref: 110
 title: Tips and Tricks
 ---

external/configuration-guides/vpn.md

@@ -1,4 +1,5 @@
 ---
+lang: en
 layout: doc
 redirect_from:
 - /doc/vpn/
@@ -7,5 +8,6 @@ redirect_from:
 - /doc/VPN/
 - /wiki/VPN/
 redirect_to: https://github.com/Qubes-Community/Contents/blob/master/docs/configuration/vpn.md
+ref: 102
 title: VPN
 ---

external/configuration-guides/w3m.md

@@ -1,4 +1,5 @@
 ---
+lang: en
 layout: doc
 redirect_from:
 - /doc/w3m/
@@ -6,5 +7,6 @@ redirect_from:
 - /doc/W3m/
 - /wiki/W3m/
 redirect_to: https://github.com/Qubes-Community/Contents/blob/master/docs/configuration/w3m.md
+ref: 101
 title: Reducing the fingerprint of the text-based web browser w3m
 ---

external/configuration-guides/zfs.md

@@ -1,4 +1,5 @@
 ---
+lang: en
 layout: doc
 redirect_from:
 - /doc/zfs/
@@ -6,5 +7,6 @@ redirect_from:
 - /doc/ZFS/
 - /wiki/ZFS/
 redirect_to: https://github.com/Qubes-Community/Contents/blob/master/docs/configuration/zfs.md
+ref: 111
 title: ZFS
 ---