Add gettext dep to README, tested system note update (#24)

* Added build requirement w/ Ubuntu/Debian command

Build requirements were added along with the relevant Ubuntu/Debian apt command to install all of them in one go. The command was tested on Linux Mint 18.2 KDE, which is based on Ubuntu 16.04.1 LTS.

* Updated build dep install command

`apt` command for installing all build dependencies has been updated to account for Kirigami 2. This was tested on KDE Neon User Edition 5.13.

More details about test system:
`lsb_release -a`
```
No LSB modules are available.
Distributor ID: neon
Description:    KDE neon User Edition 5.13
Release:        18.04
Codename:       bionic
```
`neofetch --stdout`
```
julius@win8linux-X541UV
-----------------------
OS: KDE neon User Edition 5.13 x86_64
Host: X541UV 1.0
Kernel: 4.15.0-36-generic
Uptime: 1 hour, 47 mins
Packages: 2470
Shell: zsh 5.4.2
Resolution: 1366x768
DE: KDE
WM: KWin
Theme: Breeze Dark [KDE], Breeze-Dark [GTK2/3]
Icons: Breeze-dark [KDE], Breeze-dark [GTK2/3]
Terminal: konsole
Terminal Font: SauceCodePro Nerd Font Mono 9
CPU: Intel i5-6198DU (4) @ 2.800GHz
GPU: Intel HD Graphics 510
GPU: NVIDIA GeForce 920MX
Memory: 2241MiB / 7838MiB
```

* Minor update to test system note

* Added gettext dependency to README

README.md

@@ -18,9 +18,9 @@ The KCM is only build, if the -DNO_SYSTEMD option is unset or set to false.
 * KF5: I18n, Auth, Config, Package, Declarative, CoreAddons, DBusAddons, KCMUtils, Extra-Cmake-Modules, Kirigami2, Notifications
 
 ## Debian/Ubuntu command to install the build requirements:
-`sudo apt-get install libkf5config-dev libkf5auth-dev libkf5package-dev libkf5declarative-dev libkf5coreaddons-dev libkf5dbusaddons-dev libkf5kcmutils-dev libkf5i18n-dev libqt5core5a libqt5widgets5 libqt5gui5 libqt5qml5 extra-cmake-modules qtbase5-dev kirigami2-dev libkf5kirigami2-5 libkf5notifications-dev qml-module-org-kde-kirigami2 qml-module-qtquick-dialogs qml-module-qtquick-controls2 cmake build-essential`
+`sudo apt-get install libkf5config-dev libkf5auth-dev libkf5package-dev libkf5declarative-dev libkf5coreaddons-dev libkf5dbusaddons-dev libkf5kcmutils-dev libkf5i18n-dev libqt5core5a libqt5widgets5 libqt5gui5 libqt5qml5 extra-cmake-modules qtbase5-dev kirigami2-dev libkf5kirigami2-5 libkf5notifications-dev qml-module-org-kde-kirigami2 qml-module-qtquick-dialogs qml-module-qtquick-controls2 cmake build-essential gettext`
 
-**Note:** This was tested on KDE Neon User Edition 5.13, which is based on Ubuntu 18.04 LTS (Debian 9 Stretch/Sid).
+**Note:** This was tested on KDE Neon User Edition 5.14, which is based on Ubuntu 18.04 LTS (Debian 9 Stretch/Sid).
 
 ## Example: