Build modified streamline images

The official image from streamline does not currently work for the arm64
platform. As a temporary measure, the source code and docker build scripts
have been lifted from the official images and are used to build locally.

Some additional modifications are made to reduce overall image size, these
are documented in docker/README.md

docker/streamline-src/resources/lang/en/observations.php

@@ -0,0 +1,35 @@
+<?php
+
+return [
+    "activate_observation" => "Activate Observation",
+    "view_observations" => "View Observations",
+    "add_observation" => "Add Observation",
+    "observations" => "Observations",
+    "dashboard" => "Dashboard",
+    "view" => "View",
+    "export_data" => "Export data to Copy, CSV, Excel, PDF & Print",
+    "category" => "Category",
+    "measurement" => "Measurement",
+    "options" => "Options",
+    "lower_limit" => "Lower Limit",
+    "upper_limit" => "Upper Limit",
+    "edit" => "Edit",
+    "delete" => "Delete",
+    "activate" => "Activate",
+    "edit_observation" => "Edit observation",
+    "observation_name" => "Observation name",
+    "measurement_unit" => "Measurement Unit (e.g Kilograms, Centimeters)",
+    "options_or_range" => "Choose to set a range or to set dropdown options for the observation",
+    "set_ranges" => "Set Ranges",
+    "set_dropdown_options" => "Set Dropdown Options",
+    "set_drop_down_options" => "Set drop down Options",
+    "add_another_option" => "Add Another Option",
+    "set_normal_option" => "Set Normal Option",
+    "age_group" => "Age group",
+    "is_observation_compulsory" => "Is observation compulsory?",
+    "yes" => "Yes",
+    "no" => "No",
+    "submit" => "Submit",
+    "cancel" => "Cancel",
+    "create" => "Create",
+];