Move English documentation to folder en_US

doc/en_US/api-internal-task-link-procedures.markdown

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+Internal Task Link API Procedures
+=================================
+
+## createTaskLink
+
+- Purpose: **Create a link between two tasks**
+- Parameters:
+    - **task_id** (integer, required)
+    - **opposite_task_id** (integer, required)
+    - **link_id** (integer, required)
+- Result on success: **task_link_id**
+- Result on failure: **false**
+
+Request example:
+
+```json
+{
+    "jsonrpc": "2.0",
+    "method": "createTaskLink",
+    "id": 509742912,
+    "params": [
+        2,
+        3,
+        1
+    ]
+}
+```
+
+Response example:
+
+```json
+{
+    "jsonrpc": "2.0",
+    "id": 509742912,
+    "result": 1
+}
+```
+
+## updateTaskLink
+
+- Purpose: **Update task link**
+- Parameters:
+    - **task_link_id** (integer, required)
+    - **task_id** (integer, required)
+    - **opposite_task_id** (integer, required)
+    - **link_id** (integer, required)
+- Result on success: **true**
+- Result on failure: **false**
+
+Request example:
+
+```json
+{
+    "jsonrpc": "2.0",
+    "method": "updateTaskLink",
+    "id": 669037109,
+    "params": [
+        1,
+        2,
+        4,
+        2
+    ]
+}
+```
+
+Response example:
+
+```json
+{
+    "jsonrpc": "2.0",
+    "id": 669037109,
+    "result": true
+}
+```
+
+## getTaskLinkById
+
+- Purpose: **Get a task link**
+- Parameters:
+    - **task_link_id** (integer, required)
+- Result on success: **task link properties**
+- Result on failure: **false**
+
+Request example:
+
+```json
+{
+    "jsonrpc": "2.0",
+    "method": "getTaskLinkById",
+    "id": 809885202,
+    "params": [
+        1
+    ]
+}
+```
+
+Response example:
+
+```json
+{
+    "jsonrpc": "2.0",
+    "id": 809885202,
+    "result": {
+        "id": "1",
+        "link_id": "1",
+        "task_id": "2",
+        "opposite_task_id": "3"
+    }
+}
+```
+
+## getAllTaskLinks
+
+- Purpose: **Get all links related to a task**
+- Parameters:
+    - **task_id** (integer, required)
+- Result on success: **list of task link**
+- Result on failure: **false**
+
+Request example:
+
+```json
+{
+    "jsonrpc": "2.0",
+    "method": "getAllTaskLinks",
+    "id": 810848359,
+    "params": [
+        2
+    ]
+}
+```
+
+Response example:
+
+```json
+{
+    "jsonrpc": "2.0",
+    "id": 810848359,
+    "result": [
+        {
+            "id": "1",
+            "task_id": "3",
+            "label": "relates to",
+            "title": "B",
+            "is_active": "1",
+            "project_id": "1",
+            "task_time_spent": "0",
+            "task_time_estimated": "0",
+            "task_assignee_id": "0",
+            "task_assignee_username": null,
+            "task_assignee_name": null,
+            "column_title": "Backlog"
+        }
+    ]
+}
+```
+
+## removeTaskLink
+
+- Purpose: **Remove a link between two tasks**
+- Parameters:
+    - **task_link_id** (integer, required)
+- Result on success: **true**
+- Result on failure: **false**
+
+Request example:
+
+```json
+{
+    "jsonrpc": "2.0",
+    "method": "removeTaskLink",
+    "id": 473028226,
+    "params": [
+        1
+    ]
+}
+```
+
+Response example:
+
+```json
+{
+    "jsonrpc": "2.0",
+    "id": 473028226,
+    "result": true
+}
+```